History Main / ElaborateUndergroundBase

* In ''WesternAnimation/TeenTitans'', multiple villains have one of these over the course of the series, from Slade (at least twice), the HIVE Academy run by Brother Blood, and the final base of the Brotherhood of Evil.

** The University of Illinois UsefulNotes/{{Chicago}} (UIC) has an elaborate network of steam tunnels off-limits to everyone except authorized employees due to potential danger... and that one time they were used as part of a SupervillainLair in 2002. MadScientist [[https://en.wikipedia.org/wiki/Joseph_Konopka Joseph Konopka]] (better known as [[CardCarryingVillain Dr. Ch@os]] escaped to Chicago to avoid facing prison in his home state of Illinois, and converted abandoned sections of the Chicago subway system in addition to the steam tunnels into his own lair. He was eventually caught by campus police during [[TheStakeout a stakeout]] after repeated use of the steam tunnels to conduct burglaries, and was turned over to the F.B.I.

** The University of Illinois UsefulNotes/{{Chicago}} (UIC) has an elaborate network of steam tunnels off-limits to everyone except authorized employees due to potential danger... and that one time they were used as part of a SupervillainLair in 2002. MadScientist [[https://en.wikipedia.org/wiki/Joseph_Konopka Joseph Konopka]] escaped to Chicago to avoid facing prison in his home state of Illinois, and converted abandoned sections of the Chicago subway system in addition to the steam tunnels into his own lair. He was eventually caught by campus police during [[TheStakeout a stakeout]] after repeated use of the steam tunnels to conduct burglaries, and was turned over to the F.B.I.

* In a series full of {{Supervillain Lair}}s to begin with, in the ''WesternAnimation/{{Birdman}}'' episode ("Number One") that brought them into the open and really defined them as a threat, [[NebulousEvilOrganisation F.E.A.R.]] turned out to have one of these. One also appeared in the episode "The Quake Threat" (belonging to Dr. Kiroff).

* ''VideoGame/GrimDawn'' has Warden Krieg's ridiculously large basement that stretch for hundreds of meters. It spawn two levels with a cellar, tunnels, labs, storerooms, jail cells and living quarters just to name a few. It also has some [[GiantSpider giant spiders]] and various beasts that are are hostile to the Aetherials and you.

* The main characters' HQ in ''Anime/SenkiZesshouSymphogear''. [[spoiler:It's probably remnants of a {{Precursor}} race.]]
* ''Manga/SgtFrog'' has the home base of the Keroro Platoon which is built under the Hinata household, much to the chagrin of Natsumi and Fuyuki.

* ''Franchise/ResidentEvil''
** The [[Film/ResidentEvil first film]] takes place in a massive laboratory hidden underneath Raccoon City. To help with the claustrophobia the walls have a city skyline on them and are covered by blinds.

** During the Silver Age, ComicBook/LexLuthor's "Luthor's Lairs" numbered in the hundreds, and could be found anywhere. At least one of them lasted until the 30th Century, showing up in a ''ComicBook/{{Legion Of Super-Heroes}}'' story where the outlawed Legionnaires make use of it to not only get new outfits again, but find out [[MassHypnosis what caused the populace to turn against them]].

* The Ministry of Magic in ''Literature/HarryPotter'' is completely underground that can be reached via elevator telephone booth, flushing down magic toilets (no joke), Apparation or Floo powder.

* ''Anime/AldnoahZero'': United Earth Headquarters is a bunker located in southern Siberia that is 600 meters below ground and built to survive a nuclear explosion. Considering the hammer and sickle displayed on one of the hangar doors, it's possible this bunker may be a Soviet holdover from the Cold War. Or, considering the AlternateHistory, the Soviet Union might not have collapsed and is still the ruling government of Russia. It's large enough to take in thousands of refugees, and transport planes and helecopters have no trouble maneuvering inside.

** ''Anime/GreatMazinger'': Mykene were a civilization had lived underground for millennia, so their entire empire -an intrincate network of caves and caverns- was an Elaborate Underground Base.

* In ''LightNovel/Overlord2012'', the VillainProtagonist and his forces are headquartered in the Great Tomb of Nazarick, a ten-level complex so big that one of those levels contains an entire forest and a colosseum, and another (the residential area) is basically a small town unto itself.

* The ComicBook/{{Thunderbolts}} have their base located inside a mountain.
* ''Franchise/GIJoe'' is rife with these. The original Joe base, "The Pit", is hidden underneath the chaplain's assistants' motor pool at Ft. Wadsworth in Staten Island. When this is destroyed by Cobra, a new Pit is built out in the desert. And Cobra has a fair number of secret bases themselves, including an ''[[TownWithADarkSecret entire town]]'' brimming with underground evil.
* ''Franchise/{{Superman}}'':
** During the Silver Age, ComicBook/LexLuthor's "Luthor's Lairs" numbered in the hundreds, and could be found anywhere. At least one of them lasted until the 30th Century, showing up in a ''ComicBook/{{Legion Of Super-Heroes}}'' story where the outlawed Legionnaires make use of it to not only get new outfits again, but find out [[MassHypnosis what caused the populace to turn against them]].
** In ''ComicBook/ActionComics'' #271 ComicBook/{{Supergirl}} builds an underground base beneath the Arabian Desert, complete with guest and trophy rooms.
** In ''ComicBook/StrangersAtTheHeartsCore'', the alien criminal trio known as "The Visitors" have their secret base hidden inside a mountain in the Catskill Mountains.
* During the Hydra arc of [[ComicBook/JMSSpiderMan JMS's run on Spider-Man]], Peter wonders how ComicBook/{{HYDRA}} can build one of these in New York while it's taken the city three extra months to finish a subway extension.
-->''Unless...this whole thing, it's...it's...NON-UNION! The horror...the horror...''

* In ''ComicBook/SonicTheComic'' the Freedom Fighters used Kintobor's labtory containing living space, storage areas, monitoring equipment (which left plenty of screens on which to play videogames!), a hangar for the Freedom Fighters' biplane, and the mainframe of the Kintobor Computer itself. The Freedom Fighters also expanded the facility in light of their new status as guerillas, excavating further chambers for additional capacity. The most prominent of these was a prison block (less charitably, dungeon), and later Tekno's Workshop the home and workplace of Tekno the Canary.
* The titular protagonist of the comic book ''ComicBook/{{Diabolik}}'' has ''a lot'' of these, each containing gadgets, laboratories, holding cells, spare [[CoolCar Jaguar E-Types]] and loot while he and his lover Eva live in the luxury homes built right on top of them.
* ''ComicBook/ScoobyApocalypse'' has the Complex, the massive underground lab facility in Nevada where Shaggy and Velma work at the start of the series.
* ''ComicBook/StrikeforceMorituri'' has the team start off with a base hidden inside a mountain. [[spoiler:When the alien Horde discover its location, it is destroyed with a [[DeathFromAbove nuclear bombardment.]] ]]
* ''Franchise/WonderWoman'' [[ComicBook/WonderWoman1942 Vol 1]]: Paula von Gunther has a multi-room labyrinth base beneath Holliday College, where she keeps the Space Transformer and works on scientific breakthroughs for the Allies and Wonder Woman. She also lives down there to keep hidden from the Nazis.
* ''ComicBook/SonicTheHedgehogIDW'': After the Restoration's headquarters is destroyed during the [[ZombieApocalypse Metal Virus Saga]], the ''Test Run'' arc reveals that they've built a new facility beneath the ruins of the old one. Accessible through hidden elevator, it contains a command center, computer labs, a machine shop, and a central area that's designed like a mall.

** HYDRA probably had many, but after Operation Overlord and their being forced to retreat to one last base [[spoiler: aside from the section of HYDRA within SHIELD]], they might have one of these - it's in London, but London's a very big place and no one's actually sure if it's underground.

* ''Film/InvisibleInvaders'': The fallout shelter-slash-laboratory where Dr. Penner and the rest of the cast were placed to find a weakness to use against the titular aliens is as elaborate as Fifties BMovie budget allows it to get, full of research equipment and with a large garage.
* The Film/{{Megaforce}} headquarters, a bunker deep in the Nevada desert built to withstand a direct hit from a 25-megaton nuke, with all the necessary elements for training and maintaining and leading the Megaforce, and with a CoolGarage full of extensive military hardware (and Dallas then mentions that said garage is ''just'' the one for the ground vehicles, as well as joking about needing $40,000 worth of mops and brooms to keep the place clean).
* ''Film/ScreamersTheHunting''. The eponymous {{Killer Robot}}s are made in automated factories beneath the surface. The characters have an OhCrap reaction when they enter a shut-down factory and see just how ''big'' it is. Of course, someone [[IdiotBall inevitably does something stupid]] to cause it to power up again...
* ''Film/TheSantaClause'' franchise has the entire North Pole operation for Santa Claus under an ice pack in the North Pole, large enough to contain the entire Elf village to look like a surface settlement (in Canada, according to the third movie). It remains hidden because Santa and the elves have various strategies to hide it from the outside world. The rest of the world just sees the ice-cap and preserves the Secret of Santa.

* The Wildfire facility in ''Literature/TheAndromedaStrain''. The only entrance is the elevator shed, and the facility topside ''is'' what it's disguised as - a wheat modifying facility.

* The Alchemists' Guild in ''Literature/ASongOfIceAndFire'' has an elaborate underground Guildhall composed of a labyrinth of tunnels, cells, halls, and warehouses filled with highly explosive [[GreekFire wildfire]]. The place is designed to limit the damage should a cache of wildfire combust.

* The government's ''Literature/{{Daemon}}'' task force base is largely underground. The trope is subverted (in a moment that is simultaneously hilarious and horrifying) in that the Daemon's operatives [[spoiler:know exactly where the base is -- in their AugmentedReality goggles there is a huge neon sign floating above it saying "Super Secret Daemon Task Force Headquarters" - and simply allow it to continue operating because it ''poses no threat to them''.]]

** how much actual digging was required is debateable, in that what Ankh-Morpork is built on is largely Ankh-morpork. The current city is just the top level of several layers of older buildings and construction, which over the generations have sunk, buried, or just been built over so many times that it it is a whole warren of passages and compartments, with old streets ending up as sewer tunnels, and old shops now serving as the (often unknown) basements, or subbasements to current buildings.

%%* Creator/StephenieMeyer's ''Literature/TheHost''

* To a lesser extent, the cloning facility on Dantooine in ''Literature/GalaxyOfFear''.

* Literature/TheLostRedeemer: Whitecliff has many underground tunnels and chambers including a harbor, a library, and a secret tomb.
* In ''{{Literature/Doom}}: Hell on Earth'', the Mormons have built a sprawling bunker complex under Salt Lake City. [[LampshadeHanging Lampshaded]] by Fly when it reminds him of a ''Film/JamesBond'' movie.
* In ''{{Literature/Shatter Me}}'' Castle creates Omega Point, an underground city where people with gifts gather to plan a rebellion against the oppressive Reestablishment.
* In ''{{Literature/Remember To Always Be Brave}}''there are four of these. Three out of those are scenes of gory battles throughout the course of the book.
* Chrysalis Base from ''Literature/StarTrekTheEugenicsWars'' is a giant underground research facility with labs, a nuclear reactor, an underground garden and even several classrooms. Great lengths have been taken to make it aesthetically pleasing and a nice place to live to the scientists there.
* In the ''Literature/RiversOfLondon'' novel ''The Hanging Tree'', Peter notes that, since rich people don't understand why living in a city with millions of other people means you can't have a huge country house, the posh terraces in Kensington tend to have vast basements and cellars containing swimming pools and bowling alleys, which means that a) most rich people are a [[VolcanoLair volcano]] away from being supervillains and b) watching the uniforms trying to secure the building gives the impression of a ClownCarBase. (This is TruthInTelevision, to the extent that some streets in Kensington actually have a serious subsidence problem.)
* Faery Airbase in ''Literature/SentouYouseiYukikaze'' is a mixed bag, in that much of the base is aboveground, but a significant portion of the facilities and hangars are located underground, such as the Special Air Force's hangar and support facilities. There's even an UndergroundCity where Faery Air Force personnel live.

* Season Four of ''Series/{{Alias}}'' introduced APO, a black-ops branch of the CIA (that most of the CIA doesn't know about) located underneath Los Angeles and accessed by the subway.

* Season four of ''Series/BuffyTheVampireSlayer'' featured a military organization called The Initiative with a massive high-tech base underneath Sunnydale, where they held demons captive and used them for medical experiments. The Master's lair in season one also fits the trope.

* Several appear on ''Series/{{Chuck}}''. From season 2 on, Team Bartowski primarily operates out of an underground base hidden beneath the Buy More and Orange Orange. Fulcrum and the Ring both utilized them to house their Intersect research, (conversely, the CIA housed their Intersect in a normal office building) while Volkoff made use of several to house components of the Norseman weapon.

* Torchwood Three in ''Series/{{Torchwood}}'' is hidden under Roald Dahl Plass, Cardiff. This is in stark contrast to Torchwood One's tower in ''Series/DoctorWho'', which is Canary Wharf. The Torchwood Three base was a deviation from the classic luxurious underground base — aside from the central hub, it was a rat-nest of cramped rooms and converted tunnels that have been repurposed and rebuilt over decades, it was dim and dingy, and water was always leaking in from Tiger Bay. The trope is {{Lampshade|Hanging}}d in ''Children of Earth''.

* Alpha Complex from ''TabletopGame/{{Paranoia}}'' is usually an elaborate underground warren with all the super-science facilities you could ever need. [[note]]Then again, continuity has never been a big deal in ''TabletopGame/{{Paranoia}}'' so it can be a a domed city, underwater, whatever the GM desires.[[/note]]
* The dwarves of ''TabletopGame/{{Warhammer}}'' live in huge undergound cities, following the example set by Creator/JRRTolkien. And the [[RodentsOfUnusualSize Skaven]] live below those in big cities and tunnels that span every continent.
* ''TabletopGame/{{Warhammer 40000}}'' gives us the planet of Calth in the Ultramar sector, where there are bases, cities, and agricultural communities built up in the planet's massive cavern system, because the sun is deadly. Necron tomb complexes also qualify.

* The entire raison d'etre of House Telamones, Nosferatu bloodline from ''TabletopGame/VampireTheRequiem''. They build elaborate underground bases to suit the tastes of their undead betters, but woe to the Would-Be Vampire Overlord who accepts the bid from a competing firm... it's mentioned in the text that House Telamones has ''blown up'' an entire ''city block of Seattle'' rather than lose a bid.

* ''VideoGame/EvilGenius'' is entirely about building one of these, the larger and more full of traps the better! Now you just have to watch out for those pesky law enforcement agents sneaking in to make trouble...
* ''VideoGame/HalfLife'':
** The Black Mesa Research Facility is one of the biggest and most elaborate underground bases ever shown in detail. It is a repurposed top-secret rocket research facility from the Cold War that has been upgraded to house a massive Teleportation and Inter-Dimensional Travel research project. It has its own hydroelectric power plant, nuclear waste disposal facilities, and a dormitory complex big enough to allow at least the top researchers to have their families living with them, which also requires multiple security checks for all personnel when moving between sectors. Which is usually done by using the local monorail tram network. Some of the largest and longest levels of the game and its add-ons take place in the Freight Yard, which consists of a large number of warehouses and its own container terminal to unload the 40-feet-containers that arrive by train. The fact that outdoor environments look just awful in the old ''VideoGame/{{Quake}}''-derived engine may have had more than a bit to do with the base ending up mostly underground. The few outdoor levels that exist consist entirely of brown rocks and concrete walls.
** [[spoiler:In the end it takes an [[ItsTheOnlyWayToBeSure underground nuclear bomb]] to eliminate any remaining witnessess and all alien forces still inside the facility.]] Though that event might be [[CanonDiscontinuity non-canon]] and is neither mentioned by the games from the main series developers, nor does it fit with the details revealed in later games.
** It also is probably no coincidence that the Black Mesa Research Facility is located in New Mexico, putting it in the general region of the real world ''Los Alamos National Laboratory'' (atomic bomb), ''Edwards Air Force Base, Arizona'' or ''"Area 51"'' (experimental jet-aircraft), and ''Black Mesa Test Range, Utah'' (ballistic missiles).
* The Aperture Science Enrichment Center in ''VideoGame/{{Portal}}'' is located, per the [[AllThereInTheManual supplementary material]], in an abandoned salt mine in Cleveland, Ohio. ''VideoGame/{{Portal 2}}'' bizarrely retcons this to be in Upper Michigan, but also takes the player on an exploration of the true vastness of the place. Elaborate barely even begins to describe it: some parts of the game take place as much as ''four kilometers'' underground, and the player is treated to vistas of immense facilities stretching as far as the eye can see, constructed over a period of at least fifty years.

%%* The ''VideoGame/DungeonKeeper'' series.
%%* ''VideoGame/EvilGenius''
* ''VideoGame/DwarfFortress'': Although you don't technically ''have'' to do this -- one of the DF Wiki's "optional goals" is to create a fortress that is based entirely around surface structures.
* ''VideoGame/BioShock1'' takes place in a ''underwater'' city/base named Rapture, where Applied Phlebotinum is developed, refined, and horribly goes wrong - the player's stated goal is to get out alive.

** Not to mention the Shadow Shard - an alternate dimension seemingly comprised entirely of floating islands in the sky, with caves and bases dug into them anyway. If the game world had a consistent geometry, it'd likely resemble a very big ant hill with more empty space than rock.
* ''Franchise/{{Pokemon}}'':
** ''VideoGame/PokemonRedAndBlue'' and ''[[VideoGame/PokemonGoldAndSilver Gold and Silver]]'' and their remakes have the Team Rocket bases, which is actually pretty elaborate considering they tend to build them under game corners and converted ninja bases.
** The spinOff games ''VideoGame/PokemonColosseum'' and ''VideoGame/PokemonXDGaleOfDarkness'' had the Cipher Lab, which was rather complex. The only thing is, there was one floor on the upper level that was actually important for getting through the base (the button needed to unlock the door was there), so it can't be considered a true base.
** As well as the first ''VideoGame/PokemonRanger'', where the Go-Rock Squad's base is underground in a mountain.
** It continues in ''VideoGame/PokemonRubyAndSapphire'' and Emerald, with the Team Aqua and Magma bases; in the former two, the antagonistic team's base is hidden in a seaside cave near Lilycove City, while in Emerald, Team Aqua takes the cave and Team Magma has a base inside the Hoenn region's active volcano, Mt. Chimney.
** In ''VideoGame/PokemonBlackAndWhite'', Team Plasma built N's Castle underneath the Pokémon League. (It still exists in [[VideoGame/PokemonBlack2AndWhite2 the sequels]], but it isn't a proper base anymore and has long since been abandoned.)
** ''VideoGame/PokemonXAndY'' has one Team Flare base under Lysandre Cafe and one underground at Geosenge Town.
* The ''VideoGame/NoOneLivesForever'' series had a couple. The first game had one in the US Pacific Northwest and an underground rocket launch facility somewhere in the South Pacific. The 2nd had an underwater base you had to infiltrate.

* In ''VideoGame/{{Wasteland}}'', as well as ''VideoGame/Wasteland2'', numerous pre-apocalyptic military bases and research complexes can be explored. Some of them were adapted to fit their current users' needs, others are abandoned or still serving their intended purpose, crawling with formidable enemies.

* ''VideoGame/FinalFantasyV'' had the Catapult, an underground/underwater base of LostTechnology. Among other things, it features an airship docking bay, a teleporter and a ship-sized elevator to the sea surface. And the icing on the cake? It's ''yours'' now.
* The entirity of ''VideoGame/{{Overblood}}'' takes place in one.

** ''VideoGame/{{Halo 3}}'' - the second level takes place in Crow's Nest, an "old 20th century" military base inside Mount Kilimanjaro, which has been re-activated after the Covenant took over Earth. This base comes fully equipped with a hangar bay, hidden landing pads, big imposing steel doors and a war room, complete with big screens and BridgeBunnies.

* In ''VideoGame/ThiefIITheMetalAge'', the Cetus Project is run from Markham's Isle, a former pirate base taken over by the Mechanists. As you learn when you go there, the administration of the project is a bit complicated, but Markham's Isle certainly fits the IslandBase and Elaborate Underground Base tropes.

* ''VideoGame/DeusEx'':
** The first game concludes in [[spoiler:Bob Page]]'s base beneath Area 51. On the good side, Tracer Tong has a sophisticated laboratory several floors beneath his [[TheTriadsAndTheTongs Triad's]] compound.
** UNATCO Headquarters is itself underground, with [[spoiler:an MJ-12 base]] beneath it. Yes, the game has an example of [[UpToEleven an underground base beneath another underground base.]]
** UNATCO Headquarters makes a return appearance in ''VideoGame/DeusExInvisibleWar''.
** ''VideoGame/DeusExHumanRevolution'' features several underground bases - a FEMA facility, the Harvesters' hideout, and [[spoiler:Panchaea]] to name a few.
* ''Franchise/TheElderScrolls''
** In the backstory, the [[OurDwarvesAreDifferent Dwemer]] combined this with AdvancedAncientAcropolis, building their complex and [[SteamPunk technologically]] [[{{Magitek}} advanced]] cities into the ground. Some, such as their strongholds around Red Mountain in Vvardenfell and Blackreach beneath Skyrim, are absolutely massive and extremely elaborate. Justified as they were known to use geothermal energy to power their cities, which also justifies their [[RagnarokProofing preserved states]] and {{Eternal Engine}}s that are still running when visited in the games even though the Dwemer have been gone for thousands of years. (Along with their habit of [[RealityWarper bending the laws of physics and nature]].)
** ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'' has dozens of caves and grottos, some of which get quite elaborate, and are usually home to smugglers, bandits, or worse. Dunmer Ancestral Tombs and the afore-mentioned Dwemer ruins are also typically built into the ground.
** In ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'', you can get one for yourself via the ''Thieves Den'' DLC. It is pirate-themed and, once taken over, allows you to recruit pirates to give services (like skill-training and selling stuff like lockpicks) and go out stealing for your benefit.
** ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' continues the tradition of having countless smuggler/bandit/necromancer/etc. hideouts in the form of underground caves and ruins. Once again, many get extremely advanced. This is especially true of the old Nordic burials, which are complete underground ruins that can reach the size of full blown cities. Additionally, the Dwemer ruins return in full force with plenty of great examples, many of which have been taken over by their former SlaveRace, the Falmer. The Falmer are also shown to be capable of constructing elaborate networks of suspended bridges and platforms.
* The area under the Optimology building in ''[[VideoGame/ChzoMythos 6 days a Sacrifice]]'' counts.
* In ''[[Videogame/GabrielKnight Gabriel Knight: Sins of the Fathers]]'', the voodoo cartel has a temple doubling as their headquarters [[spoiler:under Jackson Square]]. It's hinted to have been built in the 19th century when [[spoiler:the cathedral had to be rebuilt from scratch]]. Still, hiding a secret side project that big would take a lot from Marie Laveau's followers and clients.
* In the first ''Videogame/MegaManZero'' game, the LaResistance's base is located underneath an abandoned city. While the "base" itself is run-down, there are still some machinery functioning there, like an elevator and a teleporter. The base, after numerous attacks, was completely abandoned by the group in favor of a ''more'' elaborate, newer base (although it's not underground anymore).
* Vanishing Gungaroo's stage from ''VideoGame/MegaManX7''.
* Most Space Pirate bases in ''Franchise/{{Metroid}}'' games tend to be these. Probably because both their homeworld and their main base at Zebes are plagued by near-constant acid rain.
* ''VideoGame/ShadowComplex'' is a {{Metroidvania}} game that takes place in one gigantic base.
* Naoto's dungeon in ''VideoGame/{{Persona 4}}'' is one of these.
* The Alpha Protocol base in, well, ''VideoGame/AlphaProtocol'' is a large underground complex apparently located somewhere in the American northwest. Reaching it is pretty difficult; agents are sedated into unconsciousness and transported to the location, via aircraft and boat in order to keep the base's location secret. [[spoiler: At least until the endgame, where Mike arranges for his allies to track him while he's being sedated and ruin everyone's whole week with a surprise assault.]]
* ''VideoGame/ColossalCave'', including the maze of twisty little passages, all alike.

* Fort Schmerzen in ''VideoGame/MedalOfHonor'' and ''Allied Assault''.
* The ''VideoGame/{{Descent}}'' lives for this trope. Granted, a lot of them are mines, but there are a bunch of military, scientific, and testing facilities as well. Of particular note is the final level of ''Descent 3'', Dravis' Stronghold.
* ''VideoGame/MetalGear'':
** In ''VideoGame/MetalGear'' and ''VideoGame/MetalGearSolid'', the titular HumongousMecha is hidden in one of these.
** ''VideoGame/MetalGear2'' has a variation: Although Metal Gear D is fought in the third (sixth?) basement floor of the main building of Zanzibar Land's detention center, it is not specified if it was actually the main hangar for Metal Gear D.
** In ''VideoGame/MetalGearSolidPortableOps'', there are three elaborate underground bases: One is the Nuclear Storage Facility (which is the deepest mapped area of the game), another is the Silo Complex (which is pretty deep underground, although the mapped areas themselves are actually shallower than the Nuclear Storage Facility), and it was originally intended in-game to have more than one missile silo. The last one isn't actually visited by the Player: [[spoiler: It is the underground bunker underneath Langley that the CIA director attempted to retreat under with the impending nuclear strike against America with his half of the Legacy, and where Ocelot essentially murdered him and made it look like he committed suicide.]]
** In ''VideoGame/MetalGearSolidPeaceWalker'', both the heroes and the villains have elaborate bases: The Peace Sentinels had an AI Weapon assembly plant situated within a pumped storage hydroelectric power plant within Irazu's crater, an AI programming lab constructed either within an unknown ruin or an AI lab disguised as a ruin (Paz's description of the plant makes the ruin's exact origin a bit ambiguous), and an AI Weapons forwarding/Peace Walker construction base built within a gold quarry. In addition, the FSLN / KGB's drug facilities were also disguised as Banana and Coffee processing factories, and the Militaires Sans Frontieres also utilized an elaborate base in the form of an off-shore OTEC research facility.
* The Ancients in (old verse) ''VideoGame/MightAndMagic'' seems to have been fond of placing large facilities underground. The inhabitants of Deyja went one step beyond and built themselves an Elaborate Underground ''City''.
* In ''VideoGame/GrandTheftAutoSanAndreas'', Carl must infiltrate one of these under a base called Area 69. Yes, it's inspired by Area 51 (see below).
* ''VideoGame/SaintsRow2'' features a base called [[spoiler:The Pyramid]] hidden under [[spoiler:a mountain]]. Amazingly, the company that built it was [[spoiler:a clothing company]] in the first game set five years earlier. The Saints themselves have their headquarters in an abandoned hotel that collapsed below street level after an earthquake many years previously. Eventually, it is renovated into a sumptuous, neon-lit, subterranean nightclub called "Purgatory."
* In ''VideoGame/SidMeiersAlphaCentauri'', the Human Hive faction's bases (equivalent to cities in ''VideoGame/{{Civilization}}'') are stated in the fluff to be of the underground kind.
* In ''VideoGame/WinBack'', the GULF control center is hidden beneath a factory and office building.
* The Russian missile base in the last act of ''VideoGame/ModernWarfare'', which is also YeOldeNuclearSilo.
* The moonbase setting of ''VideoGame/{{Bioforge}}'', complete with hangar bay, cryogenics lab, prison, defense tower, medical experimentation lab.
* The majority of ''VideoGame/StillLife2'' is set in an unassuming house in the woods. The house is substantially larger than it appears due to the expanded atomic shelter underneath.
* ''VideoGame/{{MOTHER}}'':
** The fangame ''[[VideoGame/CognitiveDissonance MOTHER: Cognitive Dissonance]]'' has one on Mars that helps make Starmen.
** ''VideoGame/{{EarthBound}}'' has a huge base under Stonehenge in Winters.
* Underground Laborotories and Subterranian Complexes in ''VideoGame/ClickingBad''.
* ''VideoGame/CarmenSandiegoMathDetective'': The game opens with you infiltrating one used by VILE.
-->'''Chase Devineaux''': ''[whistles]'' Some new headquarters! Carmen's really outdone herself.
* ''VideoGame/Rayman3HoodlumHavoc'': The Hoodlum Headquarters area as well as the majority of the Desert of the Knaaren level, the latter potentially justified by the fact it's a natural cave system.. Doesn't explain why it also has a mini TempleOfDoom inside it too though.
* ''VideoGame/TheTuringTest'': Most of the game takes place in an underground complex located below the icy surface of Europa.
* In ''Videogame/{{Hitman 2016}}'', [[MadScientist Silvio Caruso]] has an entire laboratory filled with scientists and guards in a cave underneath his estate. It's justified as being built by the company he's working for since he's an agoraphobe who hates traveling.
* ''VideoGame/TheWitness'': [[spoiler:The high-tech complex inside the mountain]].
* ''VideoGame/TheSecretWorld'':
** TheIlluminati operate from one of these in Brooklyn: known as the Labyrinth, it can only be entered via hidden entrances concealed in the sewers and cellars of the area, and is heavily guarded against intrusions by non-Illuminati personnel. Among other things, it features testing chambers, a MadScientistLaboratory, a vast server farm, a colossal pyramid-shaped concourse, and a lot of areas that are officially off-limits to the player - unless you've made a huge mistake.
** The [[PathOfInspiration Morninglight]] have a "clubhouse" hidden under the Tokyo docks, intended to lure in the best and the brightest of potential recruits. Initially, it appears to only consist of an underground social club, with a bar, video arcade, swimming pool, shooting range and gym... but for those who've been earmarked for greater things by the Morninglight higher-ups, a [[TrackingChip chip]]-activated door reveals the complex also features a ''massive'' stadium-sized temple, complete with marble floors, sculpted columns, a colossal domed ceiling, and artworks. Plus, it's also got a cafeteria and offices for the Morninglight missionaries. [[spoiler: Of course, by the time you get there, the place has been overtaken by the Filth, and the members have either been infected, killed, or forced to flee.]]
** As if it wasn't enough to own an EvilTowerOfOminousness big enough to give the Burj Khalifa an inferiority complex, the Orochi Group have a gargantuan factory hidden beneath their Tower headquarters. Known only as the Manufactory, this area - visited only as a dungeon mission - appears to be the size of a small city, and can easily churn out enough drones, tanks and HumongousMecha to clog the streets of Tokyo if need be.
* In ''VideoGame/{{Rimworld}}'', [[ComplacentGamingSyndrome for the longest time the most dominant base-building strategy]] was to dig one into the side of a mountain. [[BoringButPractical Not the most flexible or elegant approach by any means, but by far the least resource intensive and the easiest to defend]]. Insect hive infestations and CabinFever were introduced in a later version to try to remedy things and make mountain bases less of a sure bet.
* You can build these in ''VideoGame/{{Minecraft}}''. The biggest typically have some or all of the following: entrance, underground railway tunnel, security system, security doors, central hub room, end portal, nether portal, brewery, massive automatic crop farms, automatic animal farms, enchanting room, super-smelter, armory, cinema, bedroom, garage, slime-block tank, missile silo.
* ''VideoGame/OneDogStory'' is set in a huge underground base. The dog needs to explore it to regain [[LaserGuidedAmnesia his memories]].

* The main characters of ''Webcomic/ThePocalypse'' have a base placed under a supermarket in a city.
* ''Webcomic/TimesLikeThis'': It may ''technically'' be an Elaborate Underground Base, since it's run by a multination secret-service consortium, but [[http://timeslikethis.com/index.php?id=443 Paratopia]] is actually an underground Club Med-type getaway roughly the size of Delaware.

* ''Webcomic/EverydayHeroes'':
** While the main office is above ground, the training room is in [[http://eheroes.smackjeeves.com/comics/1895720/low-humor/ the sub-sub-basement.]] Also, M.W.A.H.A.H.A.H.A.H.A.H.A. headquarters is [[http://eheroes.smackjeeves.com/comics/2133415/ch12-06/ underground.]]
** While it's hardly elaborate, Hornswoggle and family live underground in a section of the sewers [[http://eheroes.smackjeeves.com/comics/2162218/home-deep-home/ fitted out like a typical apartment.]]
* The military base where the [[HalfHumanHybrid Chio]] were created in ''Webcomic/{{Follower}}'' is one of these. Aside from the hangars, most of the base appears to be underground.

* In ''WesternAnimation/TeenTitans'', multiple villains have one of these over the course of the series, from Slade (at least twice), the HIVE Academy run by Brother Blood, and the final base of the Brotherhood of Evil.
* The Tracy Island of ''Series/{{Thunderbirds}}'' could well be the TropeCodifier.

* Vlad built himself one in ''WesternAnimation/DannyPhantom'' by the beginning of Season Three. Through an alternate universe, the underground base was a {{Foreshadowing}} element in a previous episode. [[ExecutiveMeddling Too bad he didn't find the time to put it to good use]].

* Gummi Glen in ''WesternAnimation/AdventuresOfTheGummiBears''. This version distinguishes itself by its surprisingly realistic take of an underground structure of such extraordinary complexity in medieval times. Namely, the Glen requires a sophisticated infrastructure like a mechanical ventilation system to maintain air quality while the Gummis have a variety of maintenance concerns like water levels, plant growth and erosion of the surrounding ground.

* Don't forget about the Labyrinth in ''WesternAnimation/{{Gargoyles}}''.
* The base Hacker dug out for himself in an episode of ''WesternAnimation/{{Cyberchase}}''. He abandoned it by the next episode, though.
* ''WesternAnimation/JonnyQuest'' TOS.
** "The Dreadful Doll" has an arms and submarine base being built under the surface of the island.
** "Pirates From Below" has a base in an underwater cave system equipped with submarines and hovercraft.
** "The Fraudulent Volcano". A large base was built under/in the title volcano.
* In ''WesternAnimation/TheSimpsons'', wealthy businessman and supervillain Hank Scorpio has an underground base with some sort of nuclear-powered ray gun in it, plus a laser for cutting spies in half. It also has a snack vending machine with a [[ArsonMurderAndJaywalking touchy dollar bill acceptor]].
* ''WesternAnimation/AvatarTheLastAirbender''. The [[SecretPolice Dai Li]] had a underground base under a lake.
* Perry The Platypus has one underneath ''WesternAnimation/PhineasAndFerb'''s house, and the rest of the [[FunWithAcronyms OWCA]] base seems to run beneath all of the Tri-State area. ''All'' of it.
* Hedgequarters from ''WesternAnimation/TheMysteriesOfAlfredHedgehog'' is a benign junior version of this trope.
* ''WesternAnimation/SuperFriends'': In the 1973-74 episode "The Fantastic Frerps", King Plasto has one as his headquarters, including a storage room for his Frerp eggs and a Frerps Arena for creating the eggs.
* ''WesternAnimation/InvaderZim'' operates out of a massive network of chamber pods and tunnels buried beneath his house. Among other things, he has a hangar bay for his spaceship, several labs, and an observatory.

*** The Second-In-Command of NORAD is a Canadian (it's NORTH AMERICAN Air Defense, not American Air Defense) - and yet in all the movies set in Cheyenne Mountain there is nary a Canuck in sight.

* A non-military example is the Leas Cliffe Hall in Folkestone, Kent, a 700-seater theatre/performance venue and conference center. Built in the 1920's, the only obvious sign of its presence is a modestly sized pavilion and cafe on the promenade. However, go inside and follow the steps down. The theatre complex is actually built into the cliff -- a westerly extension of the White Cliffs of Dover - and occupies several underground levels, with bars and terraces overlooking the English Channel. Elsewhere on this stretch of coast, the greater part of Dover Castle is a network of underground galleries and strongpoints built into the White Cliffs proper; it served as a major command centre in UsefulNotes/WW2, and its underground structure was greatly added to so as to protect it from German bombing and long-range artillery.
* The Matshuhiro Underground Imperial Headquarters near Nagano was intended to be this for UsefulNotes/ImperialJapan as the Allies turned the tide of UsefulNotes/WorldWarII - since Tokyo was on the coast, it would have been too risky to leave the central apparatus of the Japanese government there in the event of a US invasion. Construction began in November 1944 and it was about 75% complete when Japan surrendered the following August.

*** Many of Japanese island bases during UsefulNotes/WorldWarII featured an extensive system of underground fortifications based on both natural caves and man made tunnels--Iwo Jima, Pelilieu, Saipan, etc.

* The Yeerk Pool in ''Literature/{{Animorphs}}''

* United Earth Headquarters in ''Anime/AldnoahZero'' is a bunker located in southern Siberia that is 600 meters below ground and built to survive a nuclear explosion. Considering the hammer and sickle displayed on one of the hangar doors, it's possible this bunker may be a Soviet holdover from the Cold War. Or, considering the AlternateHistory, the Soviet Union might not have collapsed and is still the ruling government of Russia. It's large enough to take in thousands of refugees, and transport planes and helecopters have no trouble maneuvering inside.

* One of ''Manga/{{Doraemon}}''`s future gadgets allow instant creation of one of these. It can be big enough to become a city of its own, which Nobita then exploit to create his own dictatorship (PlayedForLaughs). However, one of the movie deal with the sinister encounter with LizardFolk when Nobita and co DugTooDeep...

* The Autobots' base in ''Anime/TransformersCybertron''. Mineral deposits prevent sensor scans of any kind from detecting that the terrain has been hollowed, but the equipment had to be painted with a stealth coating to prevent the Decepticons from detecting it.

* ''Franchise/{{Batgirl}}'':

* ''ComicBook/RedRobin'': Tim Drake is able to build an underground garage, gym, small lab and workshop for experimenting and making new tech and first aid/medical room beneath the old theater he renovated to live in. Fabian Nicieza and Marcus To stated the only reason it was so elaborate is that the fast approaching reboot meant they'd never have to try and justify why he could get away with so much construction without blowing his secret ID in story.
** In ''ComicBook/TheAttackOfTheAnnihilator'', Supergirl builds an whole underground base for Batgirl beneath the streets of Gotham, containing a garage, an armory, a computer and more.

* ''Film/JamesBond'', amazingly enough, has very few of these, despite the series being ridden with cartoon villains and conspirators. The closest they ever got were the hollowed-out volcano complex in ''Film/YouOnlyLiveTwice'' and Drax's Amazon launch facility in ''Film/{{Moonraker}}''.

* The Batcave from the various ''Franchise/{{Batman}}'' series, an enormous cave containing a supercomputer, [[CoolGarage garage]], [[SuperheroTrophyShelf various trophies]], and basically everything else the Batfamily needs.

* In ''ComicBook/RedRobin'', Tim Drake is able to build an underground [[CoolGarage garage]], gym, small lab and workshop for experimenting and making new tech and first aid/medical room beneath the old theater he renovated to live in.[[note]]Fabian Nicieza and Marcus To stated the only reason it was so elaborate is that the fast approaching reboot meant they'd never have to try and justify why he could get away with so much construction without blowing his secret ID in story.[[/note]]
* Xavier's mansion of the ''Comicbook/XMen'' is usually presented as being only living quarters and classrooms for students and staff; the actual base of operations is underground.

* Creator/WarrenEllis' [[LampshadeHanging Hangs a Lampshade]] on the subject in ComicBook/AstonishingXMen #34... then deconstructs it as grotesque with the very next sentence.
-->'''[[Characters/MarvelComicsCyclops Cyclops]]''': Our antagonist has serious infrastructure. I have a feeling we're going to see a classic James-Bond-Villain Crazy-Man base make itself known in a few moments.
-->'''[[Characters/MarvelComicsBeast Beast]]''': I'm always up for a Doctor Crazy-Pants volcano headquarters.
-->'''Cyclops''': This is the bit that really annoys me. All the things in this world that can be fixed with money? And every time it's "Well, I've got all this cash, but I bought myself an asteroid hideout instead."
-->'''Beast''': Aaah. That, my friend, is indeed classic.

* ''ComicBook/GIJoe'' is rife with these. The original Joe base, "The Pit", is hidden underneath the chaplain's assistants' motor pool at Ft. Wadsworth in Staten Island. When this is destroyed by Cobra, a new Pit is built out in the desert. And Cobra has a fair number of secret bases themselves, including an ''[[TownWithADarkSecret entire town]]'' brimming with underground evil.

* Creator/WarrenEllis' [[LampshadeHanging Hangs a Lampshade]] on the subject in ComicBook/AstonishingXMen #34 - ''then deconstructs it as grotesque with the very next sentence.''
-->'''ComicBook/{{Cyclops}}''': ''Our antagonist has serious infrastructure. I have a feeling we're going to see a classic James-Bond-Villain Crazy-Man base make itself known in a few moments.''
-->'''Beast''': ''I'm always up for a Doctor Crazy-Pants volcano headquarters.''
-->'''Cyclops''': ''This is the bit that really annoys me. All the things in this world that can be fixed with money? And every time it's "Well, I've got all this cash, but I bought myself an asteroid hideout instead."''
-->'''Beast''': ''Aaah. That, my friend, is indeed classic.''

[[folder:Film]]

* The supercriminal Diabolik in the movie ''Film/DangerDiabolik'' has a huge underground lair. The movie was shown as the last ''Series/MysteryScienceTheater3000'' episode:
--> '''Mike:''' Wow, occasionally a spelunker just wanders in: "Hey, what the hell?!"

* ''Film/HollowMan'' - Secret underground lab [[spoiler: accessible by a single secure elevator, which Sebastian uses to trap his coworkers.]]

* ''Film/TheIsland'': An underground base is used to [[spoiler:house clones who are led to believe that the outside is a wasteland]]. The lair is taken straight from the original comics (see ComicBook section above).

** In ''Film/ResidentEvilExtinction'' [[EvilCorp Umbrella]] has moved all their staff to secured underground facilities due to the ZombieApocalypse.

* ''Film/THX1138'': Doesn't gets more elaborate than an entire undergound ''city''.

* In ''Film/X2XMenUnited'' the underground base becomes a plot element when the SpySatellites actually detect the CoolShip in its hangar underneath the Mutant Academy. William Stryker uses this evidence to convince the President to okay a commando strike on the school, secretly to further his plan to wipe out all mutantkind. Stryker's also got an Elaborate Underground Base of his own.

* The government's ''Literature/{{Daemon}}'' task force base is largely underground. The trope is subverted (in a moment that is simultaneously hilarious and horrifying) in that the Daemon's operatives [[spoiler:know exactly where the base is - in their AugmentedReality goggles there is a huge neon sign floating above it saying "Super Secret Daemon Task Force Headquarters" - and simply allow it to continue operating because it ''poses no threat to them''.]]

* Creator/StephenieMeyer's ''Literature/TheHost''

* ''Series/TheAndromedaStrain'': Team Wildfire assembles in a high-tech, underground facility to identify and defeat the titular ThePlague before it is too late, and it is located underground in order for them to experiment on it safely without fear of it leaking out.

'''Riley:''' [[{{Double Entendre}} I don't like to brag.]]

* Deep 13, from ''Series/MysteryScienceTheater3000'', supposedly. As noted, there is also one in the series finale, in the movie ''Film/DangerDiabolik''.

* Torchwood Three in ''Series/{{Torchwood}}'' is hidden under Roald Dahl Plass, Cardiff. This is in stark contrast to Torchwood One's tower in ''Series/DoctorWho'', which is Canary Wharf. The Torchwood Three base was a deviation from the classic luxurious underground base — aside from the central hub, it was a rat-nest of cramped rooms and converted tunnels that have been repurposed and rebuilt over decades, it was dim and dingy, and water was always leaking in from Tiger Bay. The trope is Lampshaded in ''Children of Earth''.

* ''VideoGame/DwarfFortress'': Although you don't technically ''have'' to do that (one of the DF Wiki's "optional goals" is to create a fortress that is based entirely around surface structures).

* From the ''VideoGame/{{Fallout}}'' {{RPG}}s, the various Vaults.

** ''VideoGame/Fallout4'' has [[BigBad The Institute]], which is ''so'' elaborate that [[spoiler:the only way to access it is through {{teleportation}} - at least until the end where you access it through other means, such as a hidden tunnel or by blasting through the surface with a HumongousMecha.]]

** Armacham Technology Corporation established the main facility for the Origin Project in an old military-industrial complex, and built the entire facility deep underground. Emphasis placed on the past tense, what with the [[EarthShatteringKaboom explosive ending]] of the first game.

** UNATCO Headquarters is itself underground, with [[spoiler:an MJ12 base]] beneath it. Yes, the game has an example of [[UpToEleven an underground base beneath another underground base.]]

* The Descent series lives for this trope. Granted, a lot of them are mines, but there are a bunch of military, scientific, and testing facilities as well. Of particular note is the final level of Descent 3, Dravis' Stronghold.

* In ''SidMeiersAlienCrossfire'', the Human Hive faction's bases (equivalent to cities in ''VideoGame/{{Civilization}}'') are stated in the fluff to be of the underground kind.

* In ''Videogame/{{Hitman 2016}}'', [[EvilutionaryBiologist Silvio Caruso]] has an entire laboratory filled with scientists and guards in a cave underneath his estate. It's justified as being built by the company he's working for since he's an agoraphobe who hates traveling.

* The eponymous ''Roleplay/{{AJCO}}'' has never been anything but one of these, even when it was manifested as Pi-TEC in an alternate reality. This is most likely because its CEO grew up in similar facilities during a nuclear war - though its ability to completely confuse and bewilder visitors might be another possible reason.
* Pelvanida from ''Roleplay/DarwinsSoldiers'' is an underground military research base. It is not really "hidden" per se, though as quite a bit of above ground infrastructure is present.

* The Tracy Island of Series/{{Thunderbirds}} could well be the TropeCodifier.
* In a series full of {{Supervillain Lair}}s to begin with, in the ''Birdman'' episode ("Number One") that brought them into the open and really defined them as a threat, [[NebulousEvilOrganisation F.E.A.R.]] turned out to have one of these. One also appeared in the episode "The Quake Threat" (belonging to Dr. Kiroff).

* Syndrome has an absolutely awesome underground base in ''WesternAnimation/TheIncredibles'', complete with the 50's-60's Tiki/Googie/Art Deco look. Egg shell people-movers, yeah! Don't forget, it was built ''inside an active volcano''.

* The Franchise/TeenageMutantNinjaTurtles live in a hideout within the sewers of New York City.
* Don't forget about the Labyrinth in ''WesternAnimation/{{Gargoyles}}''. Or the base Hacker dug out for himself in an episode of Cyberchase. He abandoned it by the next episode, though.

* ''WesternAnimation/AvatarTheLastAirbender''. The [[SecretPolice Dai Li]] had a undergound base under a lake.
* Perry The Platypus has one underneath WesternAnimation/PhineasAndFerb's house, and the rest of the [[FunWithAcronyms OWCA]] base seems to run beneath all of the Tri-State area. ''All'' of it.

* ''WesternAnimation/SuperFriends'' 1973-74 episode "The Fantastic Frerps". King Plasto has one as his headquarters, including a storage room for his Frerp eggs and a Frerps Arena for creating the eggs.
* WesternAnimation/InvaderZim operates out of a massive network of chamber pods and tunnels buried beneath his house. Among other things, he has a hangar bay for his spaceship, several labs, and an observatory.

* Underground command-and-control centers started getting popular sometime after UsefulNotes/WorldWarI, and much more so after nuclear weapons and [=ICBM=]s. [[http://www.greenbrier.com/site/bunker.aspx Greenbrier Resort]] was the site of a [=US Congressional=] command center for 30 years, until [[http://www.washingtonpost.com/wp-srv/local/daily/july/25/brier1.htm a Washington Post reporter exposed its existence in 1992.]] Cheyenne Mountain, Colorado, is quite famous as the "brain" of [[http://en.wikipedia.org/wiki/NORAD NORAD]] ([=NORth-american Air Defense=]), [=SAC=] (Strategic Air Command, bombers and land-based [=ICBM=]s) and the US Space Command (more to do with satellites, though). The latter two are now defunct, absorbed into other organisations. NORAD is now based at Peterson Air Force Base (a conventional above-ground air force base nearby), but keeps Cheyenne Mountain on warm standby.

*** There's supposedly an entire [[http://en.wikipedia.org/wiki/Moscow_Metro_2 secret subway system under Moscow]], ''bigger'' than the regular one and buried up to 200m underground, linking numerous important buildings and providing means for movement and evacuation of [=VIPs=]. Though, if the most popular purported map of the system is to be believed, it's only larger in a sense that some of its tunnels are significantly longer than the ones of the normal Metro — one of them supposedly reaches Vnukovo airport. Otherwise there are few of them, and the tunnels and stations are narrow, undecorated and spartan. The Metro 2 makes a prominent appearance in ''Videogame/{{Metro 2033}}'', where it is allegedly has vaults full of pristine military equipment.

*** The Second-In-Command of NORAD is a Canadian (it's NORTH AMERICAN Air Defence, not American Air Defence) - and yet in all the movies set in Cheyenne Mountain there is nary a Canuck in sight.

** Offutt Air Force Base is rumored to have an underground command center proof against anything short of a direct hit with a nuke. It's impossible to be certain, because those chambers are ''not'' on the Official Elementary School Field Trip tour, they're still in use. (UsefulNotes/GeorgeWBush did not fly to Omaha on 9/11 because he wanted steak for lunch ....)

* For contrast, Britain had Kelvedon Hatch Nuclear Bunker, a base for the nation's power structure hidden beneath a nondescript house. Apparently, it was active until 1992 (but only ever activated once: not for a nuclear crisis but for the poll tax riots). [[http://www.muddyclay.com/october.htm This site]] has pictures of it. It's now a tourist attraction and the real command centre is somewhere secret.

* A non-military example is the Leas Cliffe Hall in Folkestone, Kent, a 700-seater theatre/performance venue and conference centre. Built in the 1920's, the only obvious sign of its presence is a modestly sized pavilion and cafe on the promenade. However, go inside and follow the steps down. The theatre complex is actually built into the cliff - a westerly extension of the White Cliffs of Dover - and occupies several underground levels, with bars and terraces overlooking the English Channel. Elsewhere on this stretch of coast, the greater part of Dover Castle is a network of underground galleries and strongpoints built into the White Cliffs proper; it served as a major command centre in UsefulNotes/WW2, and its underground structure was greatly added to so as to protect it from German bombing and long-range artillery.

* ''Series/{{Alias}}'':
** Season 4 introduced APO, a black-ops branch of the CIA (that most of the CIA doesn't know about) located underneath Los Angeles and accessed by the subway.
** ''Alias'' was always radically unrealistic... in an oddly gritty way. The first three seasons took a great deal of care that the actions and settings of the heroes and villains made sense ''on their own terms''. That is, given the weird premises of the setting, the actions and places made a great deal of logical sense. In Seasons Four and Five they threw all that aside and started making it all up as they went along, and it showed, as in nonsense like APO HQ.
** Case in point, in one scene in season 3, they're bringing a Master Villain (Arvin Sloane) into the Rotunda, the top secret HQ of a joint CIA/FBI/Other task force, and they made a visible point of locking all the computers, securing everything remotely 'sensitive', and the villain is brought in blindfolded and ear-plugged to keep the location and details secret from him. In season five, they bring the master villainess Irina Derevko, almost as dangerous as Sloane, into APO HQ with ''no precautions at all''. The writers just stopped trying or caring.

* ''WesternAnimation/SpiderManIntoTheSpiderVerse'': The Peter of Miles' universe has one underneath Aunt May's shed, accessed by an elevator, where he keeps alternate costumes, a computer, lab, and diagrams of criminal connections. Peter B. is noticeably jealous of this, as his base back home just consists of the garden shed itself.

* When the Eurondans decided to exterminate their enemies via AtmosphereAbuse, they built a massive underground base that could house them for decades.

* The entirity of ''VideoGame/OverBlood'' takes place in one.

* United Earth Headquarters in ''Anime/AldnoahZero'' is a bunker located in southern Siberia that is 600 meters below ground and built to survive a nuclear explosion. Considering the hammer and sickle displayed on one of the hangar doors, it's possible this bunker may be a Soviet holdover from the Cold War. Or, considering the AlternateHistory, the Soviet Union might not have collapsed and is still the ruling government of Russia.

* The EF HQ in ''Anime/AldnoahZero'' is so enormous that the large transport planes can maneuver safely within, and it can support thousands of personnel and refugees. It's been speculated by fans that it was built either in a former open pit coal mine that's been roofed over, or they've used one of the reservoirs created in TheSixties when the [[UsefulNotes/SovietRussiaUkraineAndSoOn Soviet Union]] experimented with improving the oil field productivity [[ILoveNuclearPower by the nuclear blasts]], the base being situated in the steppes of Southern Siberia.