The characters are in a cave, or occasionally a building, and after a cataclysmic event, the falling pieces of the structure separate them into smaller groups. They must either find their way out alone, or if some of them have no way to escape, they must be rescued, often with a race against time.

Very common in video games, as a plot device for separating the player character from its party, because in ''single-player'' games, too much help from friendly [=NPCs=] would take away the meat of the game. Briefer examples are simply an InescapableAmbush. More extreme examples fall under PartyScattering.

Contrast with LetsSplitUpGang, where they do it voluntarily, and NeverSplitTheParty, where they're trying to avoid it. Compare LockedOutOfTheFight.
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!!Examples:

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[[folder: Anime and Manga ]]
* ''Manga/MahouSenseiNegima''
** The BigBad used a falling stone spell to smash a [[TransportersAndTeleporters teleporter]], the chaotic magic from this scattering them all across the [[MagicalLand magical world]].
** This also happens later on during the attack by Cosmo Entelecheia during a formal party held by Godel, as a collapsing structure causes Nodoka and Asakura to be separated from Negi, Chisame, and Ku Fei just as Nodoka is about to tell Negi the final secret to the Magic World.
* It happens in ''{{Anime/Pokemon}}'' every once in a while. Though it's more of a party mismatch, since generally, Rockets, trainers, and even Pokémon can form their own groups after the rocks fall.
* Repeatedly used in ''Anime/DigimonAdventure''. First Devimon splits File Island, then [[WeWereYourTeam everyone has drifted apart]] by the time Taichi [[YearInsideHourOutside finds his way back to the Digital World]] after Etemon, then they ''choose'' to separate during the Dark Masters arc (during which one of the split groups was briefly split even further when Mugendramon blew up a skyscraper on them, casting them into different parts of the city's sewers) and don't completely regroup until the absolute last minute.
** The Digital World arc of ''Anime/DigimonTamers'' had this as something of an environmental mechanic: the data streams of the lowest plane of the Digital World would drag those caught to a completely different plane of the World; on the other hand, [[InvertedTrope they eventually used a data stream to regroup]].
** ''Anime/DigimonFrontier'' literally has the party split because rocks fell. When part of the mountain they're on is ''eaten'' by Gigasmon to increase his power, the team falls...and winds up in different parts of the digital world instead of ''splattered.''

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[[folder: Comic Books ]]
* ''MouseGuard: Winter 1152'' has Kenzie, Saxon and Sadie fall into an underground cavern, forcing Liam and Celanawe to continue without them.
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[[folder: Fan Works]]
* A variant in ''Fanfic/WithStringsAttached''. When the four are in New Zork, they walk along unconcerned that they might be recognized, since it's 1954 and in RealLife they didn't show up in America until 1964. Unfortunately, this Earth is hardly an exact parallel with theirs. They round a corner and come upon a line of kids waiting to enter a contest to win “Beagles” tickets. “The mob broke the sound barrier as they thundered into the road, and the four said 'Christ!' and fled in four different directions.” The remainder of the chapter consists of their attempts to get back together.
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[[folder: Film ]]
* In ''Film/ConanTheDestroyer'', [[spoiler:Bombaata causes one of these to get rid of Conan temporarily. Big Mistake]].
* Happens in the ''Film/{{Hellboy}}'' film with walls that come out of the ground.
* A variant occurs in the RollercoasterMine in the 2008 version of JourneyToTheCenterOfTheEarth. The handcart and the two mine cars break off at a track intersection, sending Trevor down one track (nearly crashing him into a wall), Hannah down another (that abruptly ends and almost plunges her into a ravine), and Sean down yet another (he comes out just fine).
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[[folder: Literature ]]
* ''Literature/HarryPotterAndTheChamberOfSecrets'' : When the tunnel leading to the Chamber of Secrets collapses, Ron Weasley and Gilderoy Lockhart are trapped. Harry must now face Voldemort alone.
** Or in Deathly Hallows: While the heroes are infiltrating the Ministry of Magic disguised as employees, their "supervisors" find them and order them to different locations. Our heroes panic.
* In the Creator/IsaacAsimov short story "Catch That Rabbit", the heroes decide to create a fake rockslide, to test whether a robot is malfunctioning or not, but then get caught in it and have to get the robot to dig them out.
* In ''Literature/TheHeroesOfOlympus'' series by RickRiordan, this happens at the end of ''Mark of Athena''.
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[[folder: Live Action TV ]]
* ''Series/StarTrekTheOriginalSeries'' episode "Devil in the Dark": While Kirk and Spock are hunting the Horta deep underground, the creature causes a collapse that splits them up. After the Horta appears to Kirk, Spock eventually reaches him.
** In the ''Series/StarTrekTheNextGeneration'' episode "Disaster", a NegativeSpaceWedgie traps the members of ''Enterprise'' crew within different parts of the ship. Most of them find themselves [[FishOutOfWater way out of their comfort zone]]: Troi is the highest ranking officer on the bridge, Picard has to babysit a bunch of children, and Worf has to serve as midwife.
* Happened in ''Series/{{Lost}}'' after the characters discovered the cave.
* ''Series/DoctorWho'' episode "The Doctor's Daughter". Martha Jones is separated from the Doctor by a tunnel collapse near the beginning of the episode and meets up with him again near the end.
* Happens to an extreme in season 1 of ''Series/StargateUniverse''. A small group are split off from the main cast and stranded on an alien planet when a cave-in traps them in an underground complex. Then, next episode, another cave-in splits them up, leaving one stranded unconscious whilst the others try to use the stargate network to make their way back to the ''Destiny''. Possibly the first time a cave-in has left the party split up across the breadth of a galaxy.
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[[folder: Tabletop RPG ]]
* ''StarFrontiers'' adventure [=SF0=] ''Crash on Volturnus''. While the {{PC}}s are in the Forbidden Caverns with the Ul-Mor, a cave-in will separate the two groups and leave the {{PC}}s on their own.
* The ''TabletopGame/MarvelHeroicRoleplaying'' game features a mechanic by which the GameMaster can essentially ''force'' a group of player characters to split up -- or conversely put them back together -- via spending an appropriately-sized die from the doom pool and narrating just how it happens. This is meaningful not just for the usual dramatic reasons, but also because a hero's actual ''performance'' in this game is affected by whether they're currently alone, have a single "buddy" for backup, or are working as part of a greater team.
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[[folder: Video Games ]]
* ''VideoGame/WarcraftIII'': The Frozen Throne's undead campaign has a level where Arthas is separated from Anub-Arak by a convenient earthquake and must navigate the maze alone. At level 2. [[TimedMission While the clock ticks down]]. Fortunately, Anub-Arak digs his way back to Arthas in time.
** In the NightElf campaign where, causes a cave-in which effectively separates the Warden from the rest of her party because only she has the teleportation ability required to escape otherwise certain death.
* In ''VideoGame/{{Half-Life 2}}'', Gordon is separated from Alyx this way, when Black Mesa East is attacked
* In ''VideoGame/DestroyAllHumans 2'', [[MsFanservice Natalya]] and [[AntiHero Crypto]] are split up by falling rocks in a secret volcano base in a cheap {{expy}} of Japan.
* Happens all the time in the ''KingdomHearts'' games, usually to force you to fight bosses alone. (Usually without explanation too - a forcefield just zips up when the boss appears. Though sometimes there are better reasons.)
** In at least one instance, Donald and Goofy [[GameplayAndStoryIntegration run right into a barrier as it activates and separates them from Sora]].
* Happens in ''VideoGame/EternalSonata'' when a boss villain destroys the bridge on which you're standing. Half of the party is rescued by a passing ship and the other half washes ashore in a swamp. Conveniently, the villain doesn't end up with either group and is never heard from again.
* The ''VideoGame/GuildWars Factions'' mission Arborstone has a cathedral begin collapsing once the Urn of Saint Viktor is removed. Mhenlo gets out before the front door is blocked off, but all the others have to work their way to the back exit.
* VideoGame/ResidentEvil5 has a thankfully brief case of this in chapter 4-1.
* In ''VideoGame/{{Resistance}}'', the ceiling collapses into a pile of rubble, separating the British soldiers from Nathan Hale.
* After a HopelessBossFight in ''[[VideoGame/StarOceanTheSecondStory Star Ocean: The Second Story]]'', the heroes are kicked overboard. After washing up on the beach, Rena discovers [[spoiler: Claude and Leon]] are missing, along with all of the [=NPCs=] that were on the ship, and struggles to keep calm. Meanwhile, [[spoiler: Claude]] wakes up on a different part of the beach and has to deal with [[spoiler: Leon]] crossing the DespairEventHorizon.
* Leon and Claire are split up by an exploding tanker truck in the beginning of ''VideoGame/ResidentEvil2'' and each is forced to make their way to the Raccoon City police station alone.
** Also happens a few times in ''VideoGame/ResidentEvil0''. Since partnership is important in that game, it's all the more troubling when it occurs.
* In ''VideoGame/SuperPaperMario'', Mario and company get separated [[spoiler: after Dimentio blasts them all to the [[ToHellAndBack Underwhere.]]]]
* In VideoGame/FireEmblem, the Morph Kisuna ensnares the player's party and uses his magic to divide them into two groups.
* In ''VideoGame/SilentHillHomecoming'', this happens in the prison level almost immediately after meeting your companion.
* In ''VideoGame/HeadOverHeels'', after spending some time getting the two characters together, the game continues to come up with inventive ways of splitting them up again.
* In ''VideoGame/{{Exile}}''/''VideoGame/{{Avernum}} III'', this happens a few times, most notably when defeating the Slime and Cockroach plagues.
* Subverted in ''VideoGame/FinalFantasyV''. The party falls down a hole, with three of them waking up in a large room and the fourth in a small closed-off chamber nearby. After some brief discussion the majority decide to carry on by themselves and assume their missing party member will catch up with them later on. Cue the man himself popping out of an underground passage to berate the party for planning to leave without him.
* The first two ''VideoGame/MarioAndLuigi'' games.
* In ''VideoGame/BlackSigil'', not long after entering the House of Black Stone, your party of three will be broken down, with Kairu alone and Asi with Aurora. It only takes a few minutes before you're together again, though.
* Happens briefly in ''VideoGame/{{Xenoblade}}'', after the destruction of [[spoiler:Galahad Fortress causes the party to fall into the ocean]].
* ''VideoGame/MegaManXCommandMission'' has this happen at the very beginning. An explosion separates X from Zero and Shadow, but they can still communicate with each other.
* This happens at the end of Chapter 5 of ''VideoGame/{{Mother 3}}'', where Lucas and company are split up after falling from the Mother Porkship, because the Rope Snake proved to not be as useful as Duster thought for holding on. However, instead of having to play as all the different characters in their separate groups afterward, all the gameplay just focuses on Lucas trying to find the other party members.
* In ''VideoGame/{{Ib}}'', Garry gets separated from the girls by large vines suddenly springing up from the ground. Ib and Mary press forward to try to find something to take care of the vines...only for a statue to block their way back to Garry. Garry finds another way out after he realizes they aren't coming back, and you spend the next section of the game switching back and forth between playing as Ib and playing as Garry.
* At the end of the ''VideoGame/FalloutNewVegas'' DLC ''Honest Hearts'', if you side with Joshua Graham to crush the White Legs, the immediate path through the canyon will be blocked by a rockslide halfway, forcing you to detour through the caves as well as separating you from Joshua.
* The frequency with which this happens in ''TheLastStory'' is laughable; generally at least once per major dungeon. Bonus points for the rubble often being [[InsurmountableWaistHighFence barely above waist height or easily traversable]].
* A subversion occurs in ''Lonesome Road'' when a cave-in blocks your path through the Divide, but ED-E doesn't get taken from you until after circumventing the impasse.
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[[folder: Western Animation ]]
* ''WesternAnimation/AvatarTheLastAirbender'' has the Season 2 episode “The Cave of Two Lovers,” in which a cave-in causes Aang and Katara to be separated from Sokka, leaving Sokka with the hippie musicians.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' does this in the first episode of Season 2, with the mane six getting separated by one of Discord's pranks.
* ''WesternAnimation/CodeLyoko'' had one or two examples happen. A notable example was in Season 3's Final Round where William and Aelita were separated by Sector 5's ever-changing appearance.
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