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1[[quoteright:225:https://static.tvtropes.org/pmwiki/pub/images/tunnels_series_excluding_terminal_5914.jpg]]
2
3''Tunnels'' is a Middle Grade / YoungAdult subterranean fiction series by Roderick Gordon and Brian Williams. The series consists of six books. A manga based off the books was released in Japan, and film rights have been given to Vincenzo Natali, though [[DevelopmentHell production has never started]].
4
5Will Burrows is a fourteen-year-old boy whose major passion is digging. He often helps his archaeologist father perform excavations in the London Borough of Highfield. However, he gets more than he bargained for when his father's latest investigation leads to the discovery of an underground city called the Colony, which has remained hidden for centuries from the "Topsoilers" on the surface. However, the tyrannical Styx ruling class of the Colony has come up with a plan to commit genocide on the Topsoilers and reclaim the surface for themselves. Because AdultsAreUseless, it is up to Will and various friends of his to stop the Styx, a quest that takes them ever deeper into bowels of the Earth.
6
7* ''Tunnels'' (2007). Originally published as ''[[WordSaladTitle The Highfield Mole: The Circle in the Spiral]]'' in 2005. The earlier edition was self-published and few copies were actually sold.
8* ''Deeper'' (2008).
9* ''Freefall'' (2009).
10* ''Closer'' (2010).
11* ''Spiral'' (2012).
12* ''Terminal'' (2013).
13
14-----
15!!This series includes examples of:
16
17* AbortedArc: [[spoiler: the Dominion plot]] was simply forgotten after the end of Closer. Arguably it becomes unimportant due to the events of Spiral, but there was simply no mention of it whatsoever.
18* AbsentMindedProfessor: Dr. Burrows in spades. Also Will has picked up a little of this from his [[spoiler:foster]] father.
19* ActionBomb: In ''Spiral'', [[spoiler:the Styx use the Dark Light to brainwash people into being action bombs.]]
20* ActionGirl: Elliott is a crack shot with a rifle and can consistently outperform any of the male heroes save [[TheMentor Drake]] on a usual day. Celia grows into one after [[spoiler: overcoming her Darklighting]] and [[TookALevelInBadass grinding out a ton of levels in badass]].
21* AdultsAreUseless: Played straight with the Burrows parents, but pretty well averted below-ground. For a story with kids as the protagonists, there are a surprising number of competent adults. Most of the antagonists are adults, and they are quite good at their jobs.
22** [[spoiler: Will's parents turn out to be a brutal justification; they were both Darklit continuously by the Styx to make them that way.]]
23* AdvancedAncientAcropolis: Dr. Burrows finds bits of evidence hinting that there was once a civilization that knew deep secrets about what lay far within the Earth. [[spoiler: Turns out they had discovered the Garden of the Second Sun. And then there's yet ''another'' apparent lost civilization within the Garden, which is revealed in Terminal to be the command center for a PlanetSpaceship--the Earth itself.]]
24* AdventurerArchaeologist: Dr. Burrows thinks of himself this way.
25* AlienAmongUs: [[spoiler:Well, the Styx turn out to be no more alien than us, but they still have a definite AliensAmongUs feel until we find out all life on Earth, Styx and weird monsters from the Deeps included, are all from the same planet.]]
26* AlienAbduction: The Styx [[UltraTerrestrials don't come from outer space]], but otherwise fit this trope to a T. They're fond of sending squads of [[EliteMooks Limiters]] to snatch Topsoilers who stumble across their civilization, as well as Topsoil scientists whose research they desire. The abductee will face the [[{{Brainwashed}} Dark Light]], then be either resettled in [[UndergroundCity the Colony]], exiled to the Deeps, executed, or returned Topsoil as a sleeper agent.
27* [[AliensInCardiff Aliens In Highfield]]: Bonus points every time a character says "But this is ''Highfield!''" [[spoiler: And the Styx aren't just another sentient race that happens to inhabit Earth; they're actually aliens...well, sort of.]]
28* AncientAstronauts: [[spoiler:At first, Will and friends think they've found evidence that aliens visited Earth in the distant past. Turns out, that never happened. They were on Earth the whole time--they ''built'' Earth.]]
29* AncientConspiracy: There's more than one. [[spoiler: First, that a group of people have been living beneath Highfield for quite a long time, with help from their secret comrades on the surface. Second, that the Styx are trying to destroy Topsoil civilization and have manipulated it for hundreds of years. Third, the Styx are aliens who look like their hosts and can go through a deadly Phase to kill off any threat to their species, and they're about to do it to humans. Fourth, there's a hidden world in the center of the Earth where all the missing links in evolution and countless living fossils exist, and ancient civilizations knew about it. Fifth, the Styx aren't really aliens at all, but AbusivePrecursors who constructed Earth as a PlanetSpaceship; they're no more alien than us.]] Wow.
30* AnyoneCanDie: No one is safe.
31* AndThenJohnWasAZombie: [[spoiler: Elliott's Styx side becomes much more apparent in ''Spiral'' and ''Terminal'', until she even grows insect limbs during the closing moments of the series.]] And then afterwards the final moments of Terminal strongly imply that [[spoiler: Will himself may be becoming a Styx.]]
32* ApocalypseHow: Genetically engineered super-virus, that's how. [[spoiler: When that plan gets tossed out the window, they switch to "turn into giant bugs and raise an army of hellish [[NighInvulnerability Nigh Indestructible]] shape-shifters."]]
33* {{Atlantis}}: At one point, while [[UnreliableNarrator wildly speculating to himself,]] Dr. Burrows believes he's found ruins left by refugees from Atlantis.
34* BadBoss: The Old Styx [[spoiler: orders three Limiters to jump down the Pore to their apparent deaths during ''Freefall'' for failing to prevent Sarah from dragging the Rebeccas down it.]]
35** [[spoiler: Rebecca One]] takes this to new levels in ''Spiral'', [[spoiler: shooting a Limiter merely because he was in her way and it would take too much time to explain to him what was going on.]]
36* BadassNormal: Well over half the human cast.
37* BeautyEqualsGoodness: You can tell Tom Cox is the bad guy by the giant ("melon-sized") tumors on his face.
38** Inverted by Styx women, who appear incredibly beautiful [[spoiler: until the phase]]
39* BewareTheSkullBase: The Skull Gate to the Colony. There is even an enormous stone skull below to complete the appearance.
40* BigCreepyCrawlies: The first we see is Dr. Burrows' dust mite the size of a small car. Elliott calls them cave cows. Later on we get similarly-sized "spider monkeys" and Brights. In ''Closer'', we even get huge ''fleas'', which are normally scavengers but are totally okay with eating you alive. [[spoiler: And the female Styx turn into these during the Phase, with insect limbs exploding out of their backs and ovipositors growing out of their throats.]]
41* BigDamnHeroes: [[spoiler:Drake and Parry's respective posses.]]
42* BeneathTheEarth: The setting.
43* BigBad: The Old Styx, in the biggest [[AvertedTrope aversion]] of NominalImportance you'll ever find in literature.
44* BigBadFriend: [[spoiler:The Rebeccas, who've been keeping tabs on Will in the guise of his little sister since they were two years old.]]
45* BizarreAlienBiology: The Styx look human, but actually take the form of whatever their host happens to be at the time. Before they looked like humans, they are known to have at least killed off the dinosaurs, meaning they may have looked like dinosaurs at one point. [[spoiler: Every once in a while, they can go through a Phase, where the females suddenly gain insect legs on their backs that can be used to communicate, and get ovipositors growing where their tongues should be. The Armagi are even stranger: they're shapeshifters that can communicate with their detached limbs--and one another--via something about electricity, and can spontaneously grow any features they need to survive in any environment. They're also transparent and [[NighInvulnerability Nigh Indestructible]].]]
46* BizarreAlienReproduction: [[spoiler: The Styx appear to reproduce like their hosts for the most part--they can even interbreed with the host species, because, just like Xenomorphs, they use the host's DNA to modify their own appearances to look just like them. During the phase the females instead produce eggs on their own and implant them into hosts from other species, creating warrior caste Styx. They can also produce Armagi, which are all male, but also multiply by planting eggs in a similar way]]
47* {{Bizarrchitecture}}: The crystal belt. There are hints that the place may even have ''wildlife''. [[spoiler: It isn't a natural formation.]]
48* BizarreSexualDimorphism: [[spoiler: Female Styx can grow giant insect legs and ovipositors during the Phase. Males? Well, they don't. The males just look exactly like their hosts, all the time. Except the Armagi, of course. The all-male Armagi, which Phase-affected female Styx produce, are shape-shifting gelatinous beings somewhere between StarfishAlien and full-blown EldritchAbomination.]]
49* BodyHorror: ''Anything'' related to the Phase.
50* BoomHeadshot: Several. How [[spoiler:Elliott]] takes out [[spoiler: Tom Cox]] in ''Closer'' and how [[spoiler: Cal]] ends the fight with the Limiter in ''Deeper''.
51* BottomlessPits: The Seven Sisters, a group of these which connect the Deeps to the [[spoiler: [[HollowEarth Inner World]] ]]. Only three are named in the series:
52** The Pore
53** Puffing Mary
54** Smoking Jean
55* {{Brainwashed}}: One of several purposes of the Dark Light. A surprising amount of people both in the Colony and the outside world have been brainwashed by the Styx.
56* BrandishmentBluff: Elliott pulls one of these in ''Closer''.
57* BrickJoke: Jiggs is played for drama this way. The statue of Tom Cox is a comedy example between ''Closer'' and ''Terminal''.
58* BrokenBird: [[spoiler: Chester.]]
59* CallASmeerpARabbit: Tank-sized dust mites? "Cave cows." ''Anomalocaris canadensis''? "Night crab."
60* CarryingTheAntidote: And the IdiotBall, it seems...
61* CaveMouth: The entrance to the Colony rests below an enormous stone skull.
62* ChangelingFantasy: [[spoiler:Will]], though his biological parents actually don't end up being much better at all.
63* ChangelingTale: How the Styx raise their female children, embedding them with Topsoil families to [[spoiler: infiltrate the highest levels of human society.]] (The males are trained in the Styx Citadel as soldiers.) The host families are extensively Darklit in order to ensure that the Styx children don't [[OrcRaisedByElves gain sympathy for humans.]]
64* CloudCuckooLander: Dr. Burrows is a bit... eccentric, to put it kindly. Then there's Martha.
65* LesCollaborateurs: The Styx have agents everywhere. There are even Topsoilers who collaborate with the Colony.
66* CorruptChurch: The Styx rule the Colony in the guise of one.
67* CrazyCatLady: Mrs. Tantrumi.
68* CreepyChild: [[spoiler:The Rebeccas]].
69* CreepyTwins: [[spoiler:The Rebeccas]].
70* [[DaddysLittleVillain Daddy's Little Villains]]: The Crawfly and [[spoiler:the Rebeccas. The twins and the Old Styx turn this into ''Granddaddy's'' Little Villains.]]
71* [[DarkActionGirl Dark Action Girls]]: [[spoiler: The Rebeccas]], although they prefer to leave the fighting to the Limiters.
72* DeadManSwitch: Elliott [[spoiler: claims to be]] using such a trigger connected to a [[TakingYouWithMe backpack]] full of [[ActionBomb explosives]] as leverage to negotiate with the Styx and rescue Will.
73* DeadPersonConversation: Will has several conversations with [[spoiler: Uncle Tam]], though he is clearly a dream/projection from Will's mind rather than a ghost.
74* DefectorFromDecadence: Eddie.
75* {{Delinquents}}: Speed and his gang.
76* DirtyCoward: [[DownplayedTrope Downplayed]] but still present with Sarah during her escape from the Colony. She abandons first one and then both baby sons in order to get herself away clean.
77* DisneyDeath: In ''Deeper'', [[spoiler:Caleb]] is thought dead after his encounter with [[spoiler: the Sugar Trap]], but gets better[[spoiler:.. only to be KilledOffForReal at the end.]] Also in ''Deeper'', [[spoiler: Drake]] pops up right as rain after an apparent death scene that was pretty traumatic for the protagonists, though only the reader knows he is still alive. Oh, and [[spoiler: Jiggs appears to die moments after we first actually see him, but let's be honest, who didn't totally call that he was going to turn up alive and unharmed in the opening chapter of the next book?]]
78* DisneyVillainDeath: [[spoiler:Rebecca One in Spiral.]]
79* DrillTank: Used by the Coprolites for mining. Drake commandeers one twice.
80* DueToTheDead: The "graves" Will makes for his dead relatives in the inner world.
81* {{Egopolis}}: Dr. Burrows has a somewhat alarming tendency to name things after himself.
82--> '''Dr. Burrows''': "''The Garden of the Second Sun''... I shall call it Roger Burrows Land!"
83* ElaborateUndergroundBase: The Styx Citadel, although we seldom see the inside.
84** Will and Doctor Burrows stumble upon another one built in the Deeps by the UK government as a fallout shelter, abandoned after the end of the Cold War.
85* EliteMooks: The Limiter Regiment, the branch of the Styx military responsible for patrolling the Deeps and launching covert operations Topsoil.
86* EnfanteTerrible: [[spoiler:The Rebeccas.]]
87* EvenEvilCanBeLoved: Captain Franz feels this way towards [[spoiler: Rebecca Two]], and believes she is JustFollowingOrders.
88* EvenEvilHasLovedOnes: [[spoiler: The Rebeccas]] care for each other, and [[spoiler: Rebecca Two]] falls in love with [[spoiler: a New Germanian soldier, Captain Franz.]]
89* [[EvilDetectingDog Evil-Detecting Cat]]: The Hunters, giant cats kept by Colonists, are experts at sniffing out Styx, and also really don't like them. Funnily enough, the equally giant dogs called [[HellHound Stalkers]] (normally, it's the dogs that can sniff out evil, whereas cats are often portrayed as accomplice to evil) actually are ''loyal'' to the Styx.
90* EvolutionaryLevels: In ''Spiral'', the Styx are said to be on a higher evolutionary level than humans.
91* ExoticEquipment: [[spoiler: The Styx females have a rather unsettling variant]]
92* EyepatchOfPower: Drake's orange lens that allows him to see in the dark. While he doesn't always wear it, he has it on most of the time when he has the boys under his wing, and it is seen to be one of the things that makes him so impressive. Will gets one of his own later, and continues to use it for the rest of the series.
93* FaceDeathWithDignity: After ThePlague takes [[spoiler:New Germania]], Will and Elliott find a squad of [[EliteMooks Limiters]] who spent their last moments enjoying a cup of tea.
94* FaceFullOfAlienWingWong: [[spoiler:How Styx reproduce during the Phase]].
95* FaceHeelTurn: [[spoiler:Eddie. Just when you think that he and Drake are going to overthrow the Styx, he goes and activates the Darklight programming he's put on Drake, leaves him to die in an explosion, and clears out his flat.]]
96** It may have just been that he was [[FalseFriend planning to betray Drake from the beginning]]. [[spoiler:However, given Drake's sudden betrayal,]] it's not as if you can blame him...right?
97** [[spoiler: HeelFaceRevolvingDoor: The sudden onset of the Phase brings him back to the main party fairly promptly.]]
98* FairWeatherMentor: When Drake and Elliott find themselves thrown in with Will, Chester and Cal, do they stop to let the boys catch up? Of course not.
99** That is, until Drake teaches them how to shoot and fend for themselves. But Elliott is pretty cold to them to begin with, and then again after [[spoiler: Drake's "death"]]. Both of them get better later.
100* FamilyUnfriendlyDeath: [[spoiler: Tom Cox and Sweeney]] both have their heads blown to pieces by unrelated incidents in the center of the Earth. Also [[spoiler: Caleb]]'s death--being shot by over a dozen snipers at once--at the end of ''Deeper'' is described in cringe-inducing detail.
101** [[spoiler: The virus released into the inner world]] at the end of Spiral.
102* FantasticRacism: The Colonists view the [[NotQuiteHuman Coprolites]] as an inferior race suitable only for manual labor. They even give them a demeaning name--a coprolite is fossilized feces.
103** [[spoiler: [[MirroringFactions The Styx view all of humanity the same way the Colonists view the Coprolites.]]]]
104* FatIdiot: The Chancellor of [[spoiler: New Germania.]] He lets the Styx take over his civilization without firing a shot.
105* FemmeFatale: Every adult female Styx is one, and they know it.
106* {{Foil}}: Chester and Cal, Will and Elliott, Chester and Elliott, Eddie and Drake, in some perspectives, and even Will and Chester, in a fair few situations. Heck, at some points, it can even seem like everyone to anyone.
107* TheFool: Dr. Burrows. While everyone else is fighting for their lives, he wanders in and out of lethal danger without even noticing, being far more interested in trying to decipher the odd hieroglyphic than, say, the numerous predators stalking him or his shortage of food and water.
108** [[spoiler: It makes sense, though, as he was subject to massive gradual Darklighting.]]
109* ForeignQueasine: The food in the Colony and pretty much anywhere else underground. Eyeless rat is a rare delicacy, and there are far more insect- and fungus-based dishes than Will is comfortable with. For some reason, ''Anomalocaris'' doesn't squick him out; he's more concerned about the fact that it's been extinct up top since the Cambrian (read: ''waaaaay'' before dinosaurs) and they're just eating it without a second thought. For the people of [[spoiler: New Germania]], plesiosaurus is considered a delicacy.
110* FreeFallFight: [[spoiler: Two of them at the end of Spiral. One between Jiggs and a Limiter and the other between Drake and Rebecca One.]]
111* FromASingleCell: [[spoiler: The Armagi can recover from any injury so long as just one cell survives. KillItWithFire!]]
112* FungusHumongous: The fungus growing in the Pore.
113* GasMaskMooks: The Styx soldiers of the Division.
114* GhostCity: the characters have a bad habit of leaving these in their wake.
115** The Eternal City is located in a giant cavern beneath London. It was inhabited in ancient times by the ancestors of the Styx, who were forced to flee due to a plague [[spoiler: which they eventually turned into Dominion.]]
116** [[spoiler: After Sweeney's dies, and accidentally releases ThePlague into the inner world, New Germania is swiftly left as this.]]
117** [[spoiler: London becomes this after the Armagi are unleashed on the Topsoilers.]]
118* GiantFlyer: While in the Deeps, Dr. Burrows is menaced by an [[NothingIsScarier enormous, unseen flying creature]] that frightens away a cave cow--think "Army tank with legs and bug mandibles." The readers are left to ponder what kind of animal could frighten such a heavily-armored juggernaut.
119* GoodIsNotNice: Drake. [[spoiler: Eddie. Danforth.]]
120* GovernmentConspiracy: Done to the Colonists by the Styx; lesser examples occur Topsoil, also courtesy of the Styx.
121** The bunker used to travel up and down from the Deeps has hints of this, but isn't as extreme as the usual.
122* GravityScrew: And how! The deeper the protagonists go in the first 3 books, the less gravity there is, and as it turns out there is actually a "zero-gravity belt" between the deepest deeps and the center of the earth. [[spoiler: The VERY core actually does have gravity again, in a sort of inside-out crust of a secondary Earth.]]
123* HalfBreedDiscrimination: To the extreme when it comes to the (''incredibly rare'') instance of a child between a Colonist and a Styx. This is forbidden by Styx law, so the Styx parent would be killed and the Colonist parent and child shunned and banished from the Colony.
124* HalfHumanHybrid: As mentioned, it's possible for a Styx and a human to have a child together. [[spoiler: Elliott is the only known surviving case. She recovers as quickly as a full-blooded Styx, and while she takes longer to enter the Phase, she eventually gets the insect legs too. There's no confirmation of whether or not she develops an ovipositor. But, due to her upbringing, she stays on the side of good even when she gains her bug legs.]]
125* HandsOffParenting: Will's mother is glued to the television 24-7, while his father focuses more about archaeology than his family. [[spoiler: This is because they've been Darklit by the Styx, in order to ensure that the Rebeccas receive a negative impression of humanity.]]
126* HealingFactor: Styx heal twice as fast as ordinary humans.
127* TheHeavy: The Rebecca's twins. Up until the sixth book
128* HeavyWorlder: The deeper the protagonists go into the earth, the weaker gravity is, so they can easily carry heavy loads and jump unusually high. They experience the opposite effect when traveling back to the surface after a long time in low gravity: everything is heavy and their movements are slow and labored.
129* HeelFaceRevolvingDoor: Danforth, who [[spoiler:ends up killing Chester's parents in an attempt to fool the Styx.]]
130* HeelFaceTurn: [[spoiler: Rebecca Two]] almost makes one in ''Terminal'', although she doesn't complete it due to [[spoiler: being knocked out by the explosion of GCHQ]]. During the final confrontation of the book, she remains neutral, trying to reunite with [[spoiler: Captain Franz rather than helping the Styx.]]
131* HellHound: The Stalkers.
132* HeroicBastard: Elliott.
133* HeroicSacrifice: [[spoiler: Uncle Tam and eventually Drake.]]
134** [[spoiler: Arguably, Dr. Burrows as well.]]
135* HistoricalInJoke: The earlier part of the series is loaded with these, especially regarding the Styx's history with the human race.
136** Vlad III Tepes carried out his massacres to stop the Styx, actually ''saving'' the human race.
137** Wellington may have been a Styx, if Eddie is to be believed.
138** Adolf Hitler really did look for a way to travel to the center of the Earth. [[spoiler: And his soldiers found it, though he himself never got there.]]
139* HoistByHisOwnPetard: While developing the [[spoiler:Dominion Virus]], the Styx created another virus that kills most complex lifeforms, including themselves. [[spoiler: Drake steals this from the [[MadScientistLaboratory Laboratories]] during ''Closer'', and uses it as a bargaining chip against Vane and Rebecca One at the conclusion of ''Spiral''. During the struggle, it is accidentally released, wiping out all humans, Styx, and animals in the Garden of the Second Sun. Later, the Styx are teleported into the inner world, wiping out their race.]]
140* HollowWorld: One is rumored to exist at the very center of the earth, and in the third book, [[spoiler: they find it, complete with the descendants of the Germans that Hitler sent there to found his new empire]].
141* HumanSubspecies: The Coprolites seem to be this, though Dr. Burrows suspects they aren't even ''Homo sapiens'' at all. In addition, the poorly-understood "bushmen" from [[spoiler: the Garden of the Second Sun]] are humans of some sort, but also [[spoiler: talk in the same language as the Styx, but much higher-pitched.]]
142* IdealHero: [[spoiler:Stealing the limelight from Will, Drake could be viewed as this, although he is slightly hot-headed.]]
143* IKnowYoureInThereSomewhereFight / BeatTheCurseOutOfHim: Drake uses some of both to break through [[spoiler: Chester's mum and dad]]'s brainwashing, making them look through family pictures at knifepoint and eventually resorting to nearly strangling [[spoiler: Chester]] before they recognize him.
144* TheIlluminati: Drake makes a passing mention to them on one occasion, though just to compare himself and his pals to them.
145* ImAHumanitarian: [[spoiler:Martha]]. [[spoiler: Chester]] also commits unintentional cannibalism, thinking the meat he's being fed is from wild birds.
146* TheImmune: [[spoiler:Elliott]], after drinking the Dominion vaccine.
147* ImpactSilhouette: Chester falls into a massive fungus, landing on his back with his arms and legs out, and leaves a Chester-shaped impression. It's fairly deep too, as he has to spend quite some time working himself free from the fungus. Elliott lands on her side so her impression is more of just a blob shape, and we are never shown Will's or Bartleby's. It's described as being far less amusing than it looks in cartoons.
148* InnocentBlueEyes: Will has these at first, but at the end of ''Terminal'', they become [[RedEyesTakeWarning red]] as a result of him [[spoiler:possibly becoming a Styx]].
149* InsectoidAliens: [[spoiler:The Styx might look human right now, but when they hit the Phase, the females, at least, expose some...definitely non-human parts of their anatomy.]]
150* InterspeciesRomance: It's possible for a Styx and a human to have viable offspring. However, this carries a death sentence and the children are known as [[FantasticRacism Drain Babies]], as they are often left to die in the drains beneath the Colony's South Cavern.
151** [[spoiler: Elliott]] is the product of one.
152** [[spoiler: Will and Elliott half-count, as Elliott is half-human.]]
153** [[spoiler: Rebecca Two and Captain Franz have a very creepy one, as she's only 13 (although Styx mature faster than humans) and has heavily brainwashed him, although he still has feelings for her after the Darklighting is undone.]]
154* IronicEchoCut: Done several times in ''Freefall''.
155--> '''Elliott''': "We never leave our own behind. [..] He'd do the same for us."
156--> '''Chester''': "Yes, he would. Good old Will."
157---> ''(Cut to...)''
158--> '''Will''': "Get a move on, or I'll leave you behind!"
159* IronicNurseryRhyme: ''You are my sunshine, my only sunshine...''
160* JerkAss: Everybody has their moments due to the stress and tension they're put under throughout the series. Strangely enough, any ''consistent'' JerkAss in the story mellows out eventually. The only truly consistent example throughout the whole series is, of course, the Styx, ''especially'' [[spoiler: the Rebecca Twins]], who often go out of their way to humiliate Will and make him feel like an idiot before they get down to business and try to kill him.
161** Celia Burrows becomes notorious for her pushy, loud, and rude behavior during her time in the mental hospital, mostly out of frustration from being the literal [[OnlySaneMan Only Sane Woman]]. She's insensitive towards the insane patients and [[ArsonMurderAndJaywalking monopolizes]] the [[AndThatsTerrible television]]. She rips Sarah up pretty badly, too, when she tries to question her about Will's whereabouts.
162*** Celia and Roger Burrows' Jerkassery is explained in ''Spiral'' as being caused by [[spoiler:Darklighting]].
163* JokerImmunity: Every time you think [[spoiler: the Rebecca twins]] are gone for good...
164** Subverted in the last two books. Rebecca One is blown up and Rebecca Two is dragged along with the rest of the Styx to the inner world, where she dies a slow painful death from the virus.
165* JustFollowingOrders: [[spoiler: Rebecca Two]] sees herself this way by the end of the series.
166* KarmaHoudini: [[spoiler: ''DANFORTH''. He's technically a good guy, but he killed Chester's parents and nearly the entire main cast, only to end up as well off as anyone else, and never has to answer for anything]]
167* KnightInSourArmor: Drake. He is hard and tough, but still has pretty idealistic values.
168* LetsGetDangerous: Despite being [[TheBigGuy the biggest]] of the kids and someone not to be messed with back at school, Chester underground is nearly constantly complaining, easily grossed-out, and generally the [[NonActionGuy least proactive]] of the group; however, he does have his moments here and there. Most notably the fight between the boys and the limiter where he's [[TheGlovesComeOff pushed far enough]] to skip over badass and go straight from scared to scary, going crazy for minute and trying to beat the guy to death [[ExtremeMeleeRevenge with his fists]].
169** He won't forgive the Styx for all those months of imprisonment and daily beatings in a hurry.
170* KillAllHumans: Except the ones that are loyal followers of the Styx, of course.
171* KillItWithFire: The ONLY way to deal with [[spoiler: Armagi, the shape-shifting supersoldier caste of Styx.]] They can regenerate FromASingleCell, so don't miss a scrap!
172* LetsSplitUpGang: "[[SubvertedTrope No way!]] Whenever they do that [[GenreSavvy in the movies]] something terrible happens. [[NeverSplitTheParty We're staying together]]."
173* LampreyMouth: In a brief scene in the Eternal City, a ''fungus'' with a LampreyMouth, which can also swim, is encountered.
174* LostWorld: Plenty of undiscovered species and living fossils inhabit the Deeps, but the real kicker is the [[spoiler: Garden of the Second Sun. It's implied that it's where most of the missing links in evolution existed, and everything from four-winged birds to pterodactyls to quaggas can be found there.]]
175* MadLove: Martha is obviously barking mad and has a strong but twisted kind of (parental) love for Chester, whom she sees as a [[ReplacementGoldfish substitute]] for her own dead son.
176* MamaBear: Sarah when she has her mind right. And again, Martha, see above.
177* ManEatingPlant: The Sugar Traps. Yikes. Will has a nightmare about a rock-digesting plant killing his father, but it's OnlyADream.
178* ManchurianAgent: Lots of people topsoil, including [[spoiler: members of the government, police force, and [[ArsonMurderAndJaywalking fruit vendors]]]].
179* TheMasquerade: The Colony will go to any lengths to keep its existence secret. They have collaborators on the surface, and anyone who stumbles on something they shouldn't or starts asking inconvenient questions gets disappeared. The Styx are actually behind the majority of this business. [[spoiler: The Styx are actually doing a double Masquerade--they're keeping the Colony secret from Topsoilers ''and'' masquerading as humans in the first place.]]
180* MeaningfulName: Dr. and Will Burrows are passionate about digging and exploration.
181* MenDontCry: Notably [[AvertedTrope averted]] in that there are more tears from male characters than from the ladies. Chester cries more than anyone else in the first few books, and in quite an [[InelegantBlubbering unmanly]] fashion. We usually see TearsOfFear from Chester, because scary things keep happening to him (being kidnapped, imprisoned, tortured, etc.), and tears of grief from Will, whose companions/relatives keep getting killed. Even Drake [[ManlyTears weeps]] as the people of the Rookeries are massacred.
182* MindProbe: The Dark Light.
183* MindRape: Again, the Dark Light.
184* MoleMen: The Coprolites seem to be this. They're friendlier than the normal examples, but not very intelligent.
185* MonoGenderMonsters: [[spoiler: The Armagi are all male. Not like it matters, as they're shape-shifting killing machines that don't reproduce naturally anyway.]]
186* MultiArmedAndDangerous: [[spoiler:The Styx women during the Phase. If they're in the Garden of the Second Sun, they get ''even more legs''.]]
187* MySpeciesDothProtestTooMuch: [[spoiler: Eddie, and several other male Styx if he's to be believed. Elliott seems to be the only female example, and she only half-counts because she's half-human. Rebecca Two begins to feel this way towards the end of the series, but she doesn't go as far as making a HeelFaceTurn, only remaining neutral during the final confrontation.]]
188* NighInvulnerability: All Styx have shades of this, but [[spoiler: the Armagi]] take it to the extreme.
189* NoBiochemicalBarriers: [[spoiler: The Styx are specifically evolved for this. They assume the DNA and appearance of their current host, becoming so biochemically close to the host species that they can even interbreed.]]
190* NoHoldsBarredBeatdown: The fight between the three boys and the Limiter in ''Deeper''.
191* NearVillainVictory: [[spoiler:The Styx took down Britain, and very nearly had the rest of the world while they were at it.]]
192* NoNameGiven: Drake, and arguably Eddie as well, since the name he uses is also an alias.
193** The latter does have an excuse, though, given that [[spoiler:he is a Styx and therefore no Topsoiler would be able to [[TheUnpronounceable pronounce his name]]]].
194* NotEvenHuman: In ''Spiral'', [[spoiler:the Styx are revealed to be non-human.]]
195* NotQuiteHuman: The Coprolites appear to be MoleMen, and are renowned for their subservience.
196* OffingTheOffSpring: Sarah's plan for Will, believing that he betrayed Tam to the Styx.
197* OneWingedAngel: [[spoiler: During the Phase, the Styx women grow ovipositors in their throats and insect limbs from their backs. Being exposed to the radiation of the Garden of the Second Sun makes them grow even more of each.]]
198* OrificeInvasion: [[spoiler: How the Styx reproduce during the Phase.]]
199* OurAngelsAreDifferent: Dr. Burrows suggests that Brights, which are basically giant flesh-eating flying insect-like creatures with lights on their heads like anglerfish, may have inspired depictions of angels when they emerged to the surface ages ago. [[spoiler: They actually turn out to be fiercely protective of whatever creature they imprint on, so when Martha manages to hatch a brood of them from an adult she captures single-handedly, they work as her "guardian angels."]]
200* OurMonstersAreWeird: Ever so weird.
201** There are cave cows, which are sort of like tank-sized dust mites.
202** The Eternal City is inhabited by, among other things, swimming fungi with lamprey-like mouths.
203** Brights are bioluminescent insect...things...that can move faster than the eye can see.
204** Spider monkeys, JustForFun/NotToBeConfusedWith the primate of the same name, are arachnid...things...that use echolocation.
205** ''Anomalocaris canadensis'' is still alive and kicking in the Deeps--bonus points for using a RealLife weird monster!
206** The bushmen. They're suspected to be a HumanSubspecies, but that's not certain, because [[spoiler: they speak Styx.]]
207** [[spoiler: The Styx, in general. The more we learn about them, the more bizarre they seem to get.]]
208** [[spoiler: And the Armagi, the final part of the Phase, are even weirder than the Styx that give rise to them.]]
209* OutOfFocus: [[spoiler: Rebecca 2 and the Old Styx in the last book. Quite glaring considering the Rebecca's were the main antagonists of the series, and the old Styx was the leader of the styx]]
210* ParentalAbandonment: Sarah Jerome ditches both her sons when escaping the Colony. Also the Burrows parents in their own way. Both are so caught up in their on obsessions (Celia's TV and Roger's archeological work) that they don't take care of their children at all. If anyone is the parent in the Burrows house, it's Rebecca, who does all the family's cooking, housekeeping, and bill-paying. Later they both literally abandon their family as well, Roger disappearing and going off on his own underground adventure and Celia going to live at a sanitarium and leaving her children with her equally-irresponsible sister.
211* PhlebotinumKilledTheDinosaurs: [[spoiler: Styx killed the dinosaurs during a Phase.]]
212* ThePlague: Dominion, a strain of influenza engineered by the Styx to eradicate life on the surface.
213* PlantPerson: The natives of the [[spoiler: Garden of the Second Sun]]. Though they're actually a HumanSubspecies, and look human underneath all their leaf-like skin.
214* PlanetSpaceship: [[spoiler: Earth itself turns out to be one at the conclusion of Terminal.]]
215** [[spoiler: It's vaguely hinted that the moon may be a sort of companion, as the tower in the center of the Earth has live feeds of the Earth's surface being sent to it ''right now'' from a very large, but undetected, object in orbit. Unless it's invisible, the moon is the only thing this object could be.]]
216* PoisonousCaptive: Rebecca [[spoiler: One]] shows up at Martha's shack during ''Freefall''. Claiming that she was forced into her actions by [[spoiler: her sister]], she is trying to find a way out of the bottom of the Pore and wants to see if Will's group can find a way out. During her stay, she manages to turn Will and Chester against Martha, although that didn't take much effort.
217* PowerCrystal: In ''Freefall'', the Crystal Belt is discovered, containing dozens of crystals the size of mountains crashing against one another to produce flashes of triboluminescence. [[spoiler: In ''Terminal'', it turns out that these aren't a natural feature; they're actually laid out in a uniform fashion and are powered by mysterious technology and are some kind of mechanism to propel Earth through space.]]
218* PowerGlows: [[spoiler: The mysterious, seemingly magical technology that Elliott can control due to her Styx heritage glows brightly whenever she touches it.]]
219* {{Precursors}}: [[spoiler:It turns out the Styx are these. After an unknown event billions of years ago they simply forgot who they are. They were traveling on a PlanetSpaceship when a catastrophe occurred, they lost control, and Earth fell into orbit within the Sun's habitable zone and life colonized its outer hull, giving rise over billions of years to the world we know today.]]
220* ProperlyParanoid: Sarah when topsoil. Drake and Elliott in the Deeps. Chester thinks of himself this way almost word-for-word in ''Closer''. Martha in general.
221* PsychicStatic: ''"I pray that I might not let those about me spoil my peace of mind."''
222* PuttingOnTheReich: The Styx are very fond of their black leather trenchcoats.
223** This is quite literal with [[spoiler:New Germania]], although they've mellowed quite a lot in their exile in the inner world, only keeping their [[ProudWarriorRaceGuy martial traditions]] as a way of ensuring social unity.
224** When [[spoiler:Rebecca One]] returns to the inner world, she finds that the Limiter garrison has [[spoiler:adopted New Germanian garb, as it is better adjusted for the heat than their own uniforms. She rebukes them for going on a "beach party."]]
225* RapeAsBackstory: Implied in the brief mention of [[spoiler: Elliott]]'s history.
226* RedemptionEqualsDeath: [[spoiler: Sarah]]
227* ReligionOfEvil: ''The Book Of Catastrophes''.
228* ReplacementGoldfish: Martha tries to adopt Chester as a replacement for her dead son.
229* RetiredBadass: Parry, as well as the rest of the Old Guard.
230* RewardedAsATraitorDeserves: The Styx love to do this to those who help them.
231* SceneryPorn: There's plenty of amazing geography in the Deeps. Later, Will and Dr Burrows are [[spoiler: [[TitleDrop freefalling]] to the center of the earth, and the subsequent travel through the gravity belt is quite dramatically described.]] Also, [[spoiler: [[LostWorld the Garden of the Second Sun is beautiful.]] Until the protagonists [[NiceJobBreakingItHero unintentionally destroy its biosphere. Twice.]]]]
232* SecretUndergroundPassage: As the title suggests, lots and lots of these show up in the series.
233** After Dr. Burrows disappears, Will discovers that he has been secretly digging one of these in the basement, but that someone collapsed it...
234** In ''Freefall'', Drake helps Dr. Burrows and Will escape through one of these that [[EccentricMillionaire Sir Gabriel Martineau]] had dug back in the 1600s to get to church during rainstorms without getting wet.
235* ServantRace: The Coprolites to the Colonists and Styx alike. [[spoiler: Also, the bushmen to the Styx when the Styx inhabited the Garden of the Second Sun, though they abandoned that world a long time ago; and if Elliott's suddenly-acquired race memory is accurate in Terminal, there was another ServantRace that rebelled against the Styx billions of years in the past that caused the PlanetSpaceship to stop traveling and settle into orbit around the Sun, gradually turning into Earth as life colonized its outer hull and made it habitable. She says it was the humans that rebelled, but [[ArtisticLicensePaleontology this would have happened billions of years before humans even evolved.]] Her mistake is excusable because she's probably never had an adequate paleontology lesson in her life.]]
236* ShownTheirWork: The authors really show their work in the earlier novels, as every single HistoricalInJoke and historical reference fits ''perfectly'' into real-world history.
237* SingleMindedTwins: [[spoiler:The Rebeccas]].
238** [[spoiler: Only at first. Through the course of the books, their personalities diverge quite a bit. Rebecca Two is far milder and much more rational. She rarely suggests the use of violence and acts quite kindly to several characters. Her sister, on the other hand, is very dominating and quite ruthless.]]
239* SinisterMinister: The Old Styx
240* SinisterScythe: The weapon of choice for the Styx.
241* SourSupporter: Elliott and Chester are both this for Will in ''Deeper'' and ''Freefall'', but become less "sour" and more "supporter" as the story goes on.
242* SpellMyNameWithAThe: As humans can't speak the Styx language, most Styx end up being known by their nicknames
243** The Crawfly
244** The Old Styx
245** The Young Assistant
246** [[spoiler: The Rebeccas]]
247* SpiderPeople: [[spoiler: For unknown reasons, if a Styx female affected by the Phase enters the Garden of the Second Sun, she will sprout an additional two sets of insect legs. In addition, during the Phase, females who are impregnating males swell up into bloated versions of their former selves. Combining the two makes them resemble giant spiders, which Will and his companions never miss a chance to mention.]]
248* SpiritAdvisor: [[spoiler: Uncle Tam]] to Will. Implied that Martha's dead son may be something of this to her...except she's actually crazy.
249* StarfishLanguage: The Styx speak in what appears to be a buzzing, barking language that can't be deciphered or understood, and sometimes borders on BlackSpeech. [[spoiler: During the Phase, the females can use their insect limbs to make a humming sound to communicate over long distances and command hordes of Armagi.]]
250* StatuesqueStunner: Adult female Styx are described as being very tall and extremely attractive, in a cold, detached sort of way.
251* StraightMan: Eddie, somewhat.
252* StrawNihilist: Elliott seems to think this way, though it is [[DownplayedTrope downplayed]] and not used to make philosophical arguments. She is more cynical than Drake despite being much younger, and her spiel in ''Deeper'' about how everyone is wormfood certainly fits this trope.
253* StuffBlowingUp: Drake and Elliott both carry a ''lot'' of explosives. Whenever they're faced with a problem, the first solution is to blow it up. In a whimsical moment Will even imagines a superhero alter ego for Elliott, ''the Exploding Girl'', who has nitroglycerin for blood.
254* StupidNeutral: The Coprolites appear to possess no survival instinct, and will passively let the Styx line them up and execute them without resistance, though this may be justified by their having been enslaved for generations and accepting this as the normal course of life.
255* StupidScientist: Being off on his own adventure for the first half of the series and an AbsentMindedProfessor to being with, Dr. Burrows never gets to see the Styx's brutality or anything about the Dominion plot. So he thinks Will and Drake are just being paranoid to run from them and stubbornly refuses to accept that the Styx are dangerous or that the Dominion could even happen right up until [[spoiler: his death at the hands of Rebecca Two]].
256* SufficientlyAdvancedAliens: [[spoiler: The Styx turn out to be these. And they built [[PlanetSpaceship Earth.]]]]
257* {{Supersoldier}}: Sweeney and quite possibly Jiggs.
258* TalkingToTheDead: Will does this a couple of times, notably in ''Deeper'' after he fails to keep his promise to [[spoiler: protect Cal]].
259* TheGhost: Jiggs in Spiral. [[spoiler: Until one paragraph at the very end.]]
260* ToAbsentFriends: To absent, and very brave, friends.
261* TriggerPhrase: Used by the Styx. Sensibly, the phrases are in the Styx language, so they can't be triggered accidentally.
262* TheEndOfTheWorldAsWeKnowIt: The Styx attempt to do this, twice. [[spoiler: And then it's actually done by ''Elliott'', of all people, by reactivating the [[PlanetSpaceship Earth's]] engines and making it leave orbit and head home. The result is that the entire Earth's surface becomes a frozen wasteland, killing off all life up there; it's implied that the majority of people actually survive by moving into the Colony.]]
263* TheyLookLikeUsNow: [[spoiler: The Styx look like their hosts enough to pass for the same species. They didn't look like humans until around twenty thousand years ago; it's implied that they took Cro-Magnons as their hosts and killed off the competing Neanderthals in the process.]]
264* TooDumbToLive: Downplayed by [[spoiler: Dr. Burrows]]. The Styx were going to kill them anyway, but he outright called their bluff and ''volunteered'' to be the victim, despite all the ruthless and vicious things happening around him. It wasn't the first example either.
265* TunnelNetwork: The series lives and breathes on this trope.
266** The network of tunnels beneath Highfield, which were built as an integral part of the borough: [[spoiler: The old buildings in the Topsoil city function as the ventilation system for the Colony]]. Dr. Burrows digs into the tunnel network from his basement.
267** The Labyrinth is a network of tunnels, some natural, some manmade, that connects the Colony and the Eternal City.
268** The Colony is a system of natural caverns connected by manmade tunnels.
269** The Styx Citadel has a network of tunnels allowing them to conduct operations anywhere in London.
270** [[spoiler: The pyramids in the Garden of the Second Sun are connected by an underground system of tunnels inhabited now by the "bushmen."]]
271* TwinSwitch: Done regularly by [[spoiler:the Rebeccas]].
272* TheUnmasquedWorld: ''The Book of Catastrophes'' foretells this, calling it the Discovery and warning that the Topsoilers will destroy the Colony unless the Colonists destroy them first.
273* {{Ultraterrestrials}}: [[spoiler:The Styx]]
274* TheUnpronounceable: The language of the Styx can't be pronounced by humans, or even represented by letters and words.
275* WellDoneSonGuy: Downplayed. Will is revealed to be something of this in ''Deeper'' when Rebecca derides him for spending so much time digging and helping Dr. Burrows, "digging for daddy's love".
276* WhatHappenedToTheMouse: [[spoiler: Jiggs]] is mentioned several times throughout ''Spiral'' by Drake and Parry. For several hundred pages not one mention of him is made, [[spoiler: until he suddenly appears in the Garden of the Second Sun, kills several Limiters, distracts Rebecca One, saves Will, and tumbles into the inner space of the Earth's core]], and is presumably killed. [[spoiler: He lives, and plays a more important role later.]]
277* WildCard: [[spoiler: Eddie]].
278--> "He's not on your side anymore!"
279--> "[[HeelFaceRevolvingDoor So, he's on your side]]?"
280--> "[[ChronicBackstabbingDisorder No]]."
281--> "Well, whose blooming side is he on then?"
282--> "[[TheChessMaster I honestly don't know]]."
283* {{Yandere}}: Martha.
284* YankTheDogsChain: Poor Chester gets his chain yanked twice. First is Will's disastrous attempt to rescue him from the hold in ''Tunnels'' where everyone gets away ''except'' Chester. And then he spends months underground wanting only to go home to his family on the surface, but when he's finally reunited with his parents, [[spoiler: they've been brainwashed and don't recognize him as their son. Fortunately Drake is able to fix them]].
285** [[spoiler: Only for them to be killed the very next book. By a double agent who later turns out to be a triple agent. Understandably, he doesn't take it well]]. Then, [[spoiler:he is killed in ''Terminal'' by Martha]].
286* YouCantThwartStageOne: [[spoiler: The Dominion virus still ends up in Styx hands by the end of ''Closer'']] despite several books being spent trying to get rid of it entirely. However, Will and Eliot do at least manage [[spoiler: to get the cure to the surface]]. Then in ''Spiral'' there is a double subversion; [[spoiler: the first phase is averted without any difficulty, meaning stage one is thwarted. However, the backup Phase goes ahead on the surface, effectively making things worse than if stage one hadn't been thwarted]].
287* YouHaveFailedMe: The Old Styx does this to a trio of Limiters at the beginning of ''Freefall'', ordering them to jump into the [[BottomlessPits Pore]] for failing to prevent [[spoiler: the Rebeccas from being pushed down it by Sarah Jerome.]] At the end of the book, he [[RewardedAsATraitorDeserves does the same]] to Tom Cox for failing to capture Drake.
288* YouHaveOutlivedYourUsefulness: Standard Styx procedure towards anyone who helps them.
289* YouShallNotPass: [[spoiler:Uncle Tam]]'s death in ''Tunnels''.
290* YouWouldntShootMe: [[spoiler: Roger]] doesn't say this exactly, but his sarcastic "if you want to murder someone, you can start with me" counts. As it turns out [[DoNotTauntCthulhu the person]] he's [[BeCarefulWhatyouSay taunting]] really [[TemptingFate would]] shoot him. A lot.
291--> [[TooDumbToLive "I told them to shoot me. We know they're bluffing so-"]]

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