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Sentinel is manned by a skeleton crew of only four soldiers; their by-the-book commander Sgt. Hendrichs (Creator/ThomasKretschmann); [[TheSquadette Cpl. Cassidy]] (Creator/KateBosworth) who serves as his NumberTwo; [[TheEngineer Baines]] (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist? Or has the enemy been among them all along?
to:
Sentinel is manned by a skeleton crew of only four soldiers; their by-the-book commander Sgt. Hendrichs (Creator/ThomasKretschmann); [[TheSquadette Cpl. Cassidy]] (Creator/KateBosworth) who serves as his NumberTwo; [[TheEngineer Baines]] (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) (Creator/LucienLaviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist? Or has the enemy been among them all along?
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* FamilyPortraitOfCharacterization: The photo Cassidy keeps looking at is assumed to be her family back home, including a husband she is cheating on with Sully. Cassidy tells him that the person who looks like her is actually her mother; it's a photo of her parents and brother who were killed during the war. [[spoiler:It's also a CoverIdentityAnomaly when Sully realises it's raining in the photo, when all he remembers from his childhood is the constant heat from the lack of rain in Southland. That's because Cassidy grew up in Northland.]]
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* PreciousPhoto: The photo Cassidy keeps looking at is assumed to be her family back home, including a husband she is cheating on with Sully. But Cassidy tells him that the person who looks like her is actually her mother; it's a photo of her parents and brother who were killed during the war. [[spoiler:It's also a CoverIdentityAnomaly when Sully realises it's raining in the photo, when all he remembers from his childhood is the constant heat from the lack of rain in Southland. That's because Cassidy grew up in Northland.]]
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Sentinel is manned by a skeleton crew of only four soldiers; their by-the-book commander Sgt. Hendrichs (Creator/ThomasKretschmann); [[TheSquadette Cpl. Cassidy]] (Creator/KateBosworth) who serves as his NumberTwo; [[TheEngineer Baines]] (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
to:
Sentinel is manned by a skeleton crew of only four soldiers; their by-the-book commander Sgt. Hendrichs (Creator/ThomasKretschmann); [[TheSquadette Cpl. Cassidy]] (Creator/KateBosworth) who serves as his NumberTwo; [[TheEngineer Baines]] (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? exist? Or has the enemy been among them all along?
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* RayOfHopeEnding: [[spoiler:War is likely to break out again, but Sully and Cassidy agree to defend the Sentinel against whichever side comes to claim it. And birds are supposed to have gone extinct because their migrations were ended with the sinking of the landmasses, yet swallows are seen at the end of the movie.]]
to:
* RayOfHopeEnding: [[spoiler:War is likely to break out again, but Sully and Cassidy agree to defend the Sentinel against whichever side comes to claim it.Martha. And birds are supposed to have gone extinct because their migrations were ended with the sinking of the landmasses, yet swallows are seen at the end of the movie.]]
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* FreezeFrameBonus: Sully has ''Don't shoot it's me'' written on his helmet (shown right before Hendrichs orders him to fire on the ''Aurora'').
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* FreezeFrameBonus: Sully has ''Don't shoot it's me'' written on his helmet (shown [[HypocriticalHumor right before Hendrichs orders him to fire on on]] the ''Aurora'').
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* FreezeFrameBonus: Sully has ''Don’t' shoot it's me'' written on his helmet (shown right before Hendrichs orders him to fire on the ''Aurora'').
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* FreezeFrameBonus: Sully has ''Don’t' ''Don't shoot it's me'' written on his helmet (shown right before Hendrichs orders him to fire on the ''Aurora'').
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** Hendrichs realises [[spoiler:TheMole lured away the relief ship by taking the homing beacon out in the dinghy, so he has the ''Aurora'' blown up so no-one will have a chance to leave. However he only reveals what he's found to Sully after he's been locked up by the others as a lunatic, so Sully thinks he's crazy or it's just a ruse to get himself out of his cell.]]
to:
** Hendrichs realises [[spoiler:TheMole plots the GPS position readings recorded on the Aurora's e-log. [[spoiler:From this he realised that someone deliberately lured away the relief ship by taking the homing beacon out in the dinghy, so away from Sentinel as it approached. Realising there has to be a [[TheMole Mole]] on Sentinel, he has the ''Aurora'' blown up so no-one will have a chance to can leave. However he only reveals what he's found to Sully after he's been locked up by the others as a lunatic, so Sully thinks he's crazy or it's just a ruse to get himself out of his cell.]]
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In the year 2063, GlobalWarming has caused [[FloodedFutureWorld most of the world's landmass to disappear]]. Only two continents remain, locked in a state of cold war [[SwordOfDamocles enforced]] by the military outpost "Sentinel", a tiny sea fort battered by regular storms and falling apart due to rust and metal fatigue.
to:
In the year 2063, GlobalWarming has caused [[FloodedFutureWorld most of the world's landmass to disappear]]. Only two continents remain, locked in a state of cold war [[SwordOfDamocles enforced]] by the military outpost "Sentinel", Sentinel, a tiny sea fort battered by regular storms and falling apart due to rust and metal fatigue.
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Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
to:
Sentinel is manned by a skeleton crew of only four soldiers; the their by-the-book commander Sgt. Hendrichs (Creator/ThomasKretschmann); [[TheSquadette Cpl. Cassidy (Creator/KateBosworth), TheSquadette Cassidy]] (Creator/KateBosworth) who serves as his NumberTwo; TheEngineer Baines [[TheEngineer Baines]] (Martin [=McCann=]), and 'Sully' Sullivan (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
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* HereThereBeDragons: A world map shows only two landmasses. Southland, where the protagonists are from, is marked Home Sweet Home. Northland, where the enemy is supposed to be, is marked Here Be Dragons. It's not entirely facetious as no-one's made contact with Northland for forty years, and some speculate they've all been wiped out and the government's just keeping up the pretence as a GenghisGambit.
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* HereThereBeDragons: A world map shows only two landmasses. Southland, where the protagonists are from, is marked Home Sweet Home. Northland, where the enemy is supposed to be, is marked Here Be Dragons. It's not entirely facetious as no-one's made contact with Northland for forty years, and some speculate they've all been wiped out and the government's just keeping up the pretence pretense as a GenghisGambit.
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* ScavengerWorld: The crew supplement their supplies by lowering a net into the ocean and catching the fish that are driven into it by the storm, as well as taking the dinghy out to the vast fields of floating debris. Both are risky operations because you have to get back to the Sentinel before the storm hits.
to:
* ScavengerWorld: The crew supplement their supplies by lowering a net into the ocean and catching the fish that are driven into it by the storm, as well as taking the dinghy out to the vast fields of floating debris. Both are risky operations because you have to get back to the Sentinel before the storm hits.hits, and there's not enough fuel for the outboard engine, so the dinghy has to be rowed.
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Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Creator/MartinMcCann), and 'Sully' Sullivan (Creator/LucienLaviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
to:
Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Creator/MartinMcCann), (Martin [=McCann=]), and 'Sully' Sullivan (Creator/LucienLaviscount) (Lucien Laviscount) who is Cassidy's lover. Their two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
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* TheRadioDiesFirst: Sentinel is under RadioSilence with a satellite passing overhead to relay messages in an emergency. Sully disobeys orders and sends out a report on the ''Aurora'', only to get the same message sent back to them. They realise that not only is the satellite no longer working, but it may have been down for some time.
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* TheRadioDiesFirst: Sentinel is under RadioSilence with a satellite passing overhead to relay messages in an emergency. Sully disobeys orders and sends out a report on the ''Aurora'', only to get the same message sent back to them. They realise that not only is them because it hasn't been downloaded. This raises the satellite no longer working, but it may question of how long their communications have been down for some time.down, and whether there's anyone alive back home to receive their message.
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Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Martin McCann), and 'Sully' Sullivan (Lucien Laviscount). Their two year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
to:
Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Martin McCann), (Creator/MartinMcCann), and 'Sully' Sullivan (Lucien Laviscount). (Creator/LucienLaviscount) who is Cassidy's lover. Their two year two-year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
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In the year 2063, GlobalWarming has caused [[FloodedFutureWorld most of the world's landmass to disappear]]. Only two continents remain, locked in a state of cold war [[SwordOfDamocles enforced]] by the military outpost "Sentinel", a tiny sea fort battered by regular storms and falling apart due to rust and metal fatigue.
Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Martin McCann), and 'Sully' Sullivan (Lucien Laviscount). Their two year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
Not to be confused with the 2007 post-apocalyptic film ''Film/TheLastSentinel''.
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!!This movie has the following tropes:
* AmbiguousSituation: [[spoiler:Did Cassidy murder Baines, or did he just go insane and drown himself like she said?]]
* ArtisticLicenseMilitary: Sentinel is chronically undermanned for a military base holding a WMD deemed crucial for the defence of the country (presumably because it's a suicide post if the device ever has to be used) with no leeway for crew falling sick or accidents. Instead of a unit of marines for the sole purpose of defence, they have a single pistol and artillery piece. While they take precautions against unknown boats approaching, there's no sonar against submarines which might travel beneath the bad weather and carry frogmen to attack Sentinel in between the storm surges. [[spoiler:The fact that there's a spy on board implies their enemy has the means to infiltrate Southland at the very least.]]
* BadVibrations: Things start to rattle and break on the ill-maintained sea fort as the storm surge approaches.
* BaitAndSwitch: [[spoiler:Every male character is presented as a potentially unstable threat to the others at one point or another. It's Cassidy, [[WomenAreWiser presented as the most reliable]], who turns out to be the most dangerous, as she's an enemy spy who's already murdered their relief crew.]]
* {{BFG}}: Sentinel's only defence is an artillery piece mounted on the roof.
* BreakHisHeartToSaveHim: Cassidy breaks the impasse with their commander by agreeing to stay on the Sentinel while Sully and Baines take the ''Aurora'' to get help. Having fallen in love with Cassidy, Sully then refuses to leave, so she tells him he was just a convenient fling for her. She apologises afterwards when they're all forced to stay.
* ChekhovsGun:
** [[spoiler:Sully asks Baines if he can shut down Martha in case Hendrichs goes mad and tries to set it off. Baines says he can do it given time, but is reluctant to commit an act of sabotage. But after Baines nearly sets off the bomb himself, he carries out Sully's request, a fact that Sully doesn't realise until he tries to set off the bomb.]]
** Part of the railing where Scully boards the ''Aurora'' from his dinghy has come loose. [[spoiler:It had been removed by the crew to allow their murderer, who was also in the dinghy, to come on board.]]
* DoomsdayDevice: [[CuteAsABouncingBetty Martha]] is a twenty megaton bomb that, if detonated, would create a tsunami big enough to wipe out Northland--and likely their own country as well, Baines suspects, making it a literal WorldWreckingWave.
* DecontaminationChamber: A mundane version; radiation emitted from Martha means the crew have to take regular iodine baths and then get hosed down afterwards. The seals on the bomb are decaying as well, meaning the radiation levels are increasing, but they're running out of iodine until they find more on the derelict relief boat.
* DeadMansSwitch: A pressure switch on the arming panel is held down by the operator while the bomb activation code is entered.
* EarAche: When Baines refuses to fire upon the ''Aurora'', Sgt. Hendrichs shoots his ear off.
* EarthThatWas
** Baines salvages toys from the ocean for a child he hasn't even seen yet, and talks about how the Borg chair he's futilely trying to restore is from Estonia, a country that no longer exists, requiring fabric panels that are no longer manufactured.
** Sully gives Cassidy a gift he found on the ''Aurora''; a silver incense globe engraved with a map of the world as it used to be. Neither of them can work out what it is.
* FaceRevealingTurn: [[spoiler:The person [[InTheHood dressed in a rain cape]] rowing out to the ''Aurora'' appears to be Baines until she turns and guns down the crew, revealing herself as Cassidy.]]
* FamilyPortraitOfCharacterization: The photo Cassidy keeps looking at is assumed to be her family back home, including a husband she is cheating on with Sully. Cassidy tells him that the person who looks like her is actually her mother; it's a photo of her parents and brother who were killed during the war. [[spoiler:It's also a CoverIdentityAnomaly when Sully realises it's raining in the photo, when all he remembers from his childhood is the constant heat from the lack of rain in Southland. That's because Cassidy grew up in Northland.]]
* FreezeFrameBonus: Sully has ''Don’t' shoot it's me'' written on his helmet (shown right before Hendrichs orders him to fire on the ''Aurora'').
* GiantWallOfWateryDoom: Sentinel is hit by a massive wall of water almost as high as the sea fort, which manages to knock it onto a slight angle.
* GhostShip: The ''Aurora'' is found drifting in the ocean with its crew missing, but stocked full of supplies and the kit of four marines. It's obviously the ship that was supposed to bring their relief three months ago, but what happened to them?
* GoneMadFromTheIsolation: Four marines isolated on a tiny sea fort in a vast ocean, three months after they should have gone home. The thought that everyone back home may have been nuked, or that their enemy never existed in the first place, doesn't help matters.
* GreenAesop: Find balance; stop fighting over resources and start working together.
* HelpImStuck: In the opening storm scene, Baines nearly drowns when he gets his hand stuck.
* HereThereBeDragons: A world map shows only two landmasses. Southland, where the protagonists are from, is marked Home Sweet Home. Northland, where the enemy is supposed to be, is marked Here Be Dragons. It's not entirely facetious as no-one's made contact with Northland for forty years, and some speculate they've all been wiped out and the government's just keeping up the pretence as a GenghisGambit.
* HopeSpot
** Cassidy convinces Hendrichs to allow two men to return home in the ''Aurora'' while the other two stay to guard the Sentinel. [[spoiler:That night Hendrichs sets the ''Aurora'' adrift and forces the crew at gunpoint to sink it with the cannon.]]
** Baines appears to recover [[spoiler:after trying to set off Martha, so Cassidy allows him to go with her on a scavenging trip. Sully takes the opportunity to look through the confidential files and finds he's dangerously unstable. Then he only sees one person in the dinghy rowing back to the Sentinel...]]
* NeverSuicide: [[spoiler:Sully goes to release Hendrichs, only to find he's apparently jumped from the window of his cell into the ocean. Only Sully hauls his body up in the net with an obvious head wound. Then Cassidy returns claiming Baines went mad and tried to walk off across the field of debris.]]
* NoBloodForPhlebotinum: Once the environment was screwed up and the world started flooding, humanity made things worse by fighting over what land and resources remained. [[spoiler:Cassidy tells Sully that the attempt to seize the Sentinel, and Southland after that, is a [[InvadingRefugees desperation gambit as her continent is sinking under the sea]].]]
* OnceMoreWithClarity: [[spoiler:When Scully realises the truth, we get a scene showing what happened to the ''Aurora''. Cassidy was on duty that night, so she paddled out in the dingy with the homing beacon to lead their relief boat away from the Sentinel, then shot the crew as they gathered at the rail to haul her on board.]]
* PoorCommunicationKills
** When boarding the GhostShip, Sully turns off his radio because he thinks the static will give him away. Because Hendrichs can't make radio contact, he arms Martha in case the ship is full of enemy commandoes.
** Hendrichs realises [[spoiler:TheMole lured away the relief ship by taking the homing beacon out in the dinghy, so he has the ''Aurora'' blown up so no-one will have a chance to leave. However he only reveals what he's found to Sully after he's been locked up by the others as a lunatic, so Sully thinks he's crazy or it's just a ruse to get himself out of his cell.]]
* ProductPlacement: A more subtle version than most; the movie is an Estonian production and the chair Baines is trying to restore is from Borg, a company based in Estonia.
* TheRadioDiesFirst: Sentinel is under RadioSilence with a satellite passing overhead to relay messages in an emergency. Sully disobeys orders and sends out a report on the ''Aurora'', only to get the same message sent back to them. They realise that not only is the satellite no longer working, but it may have been down for some time.
* RayOfHopeEnding: [[spoiler:War is likely to break out again, but Sully and Cassidy agree to defend the Sentinel against whichever side comes to claim it. And birds are supposed to have gone extinct because their migrations were ended with the sinking of the landmasses, yet swallows are seen at the end of the movie.]]
* ReassignedToAntarctica: There's indications that despite all the propaganda, and high pay offered to anyone who volunteers to spend two years on Sentinel, it's actually this trope. Sully is supposedly OnlyInItForTheMoney, but he's actually [[TradingBarsForStripes serving there to avoid an even longer prison sentence]]. Baines is psychologically unsuited for the role, but is sent [[BunnyEarsLawyer because he's an excellent engineer]]. Sgt. Hendrichs lost his entire unit in a NoodleIncident, something [[TheAtoner he blames himself for]] and apparently his superiors did as well.
* ScavengerWorld: The crew supplement their supplies by lowering a net into the ocean and catching the fish that are driven into it by the storm, as well as taking the dinghy out to the vast fields of floating debris. Both are risky operations because you have to get back to the Sentinel before the storm hits.
* SpreadingDisasterMapGraphic: In the title sequence an outline drawing of the continents gradually changes to the two remaining in a FloodedFutureWorld.
* SwordOfDamocles: Martha is a deterrent against a Northland invasion; an atomic bomb that will unleash a tsunami that will overwhelm the continent if Southland is attacked.
* TwoKeyedLock: Though not a very effective one. Martha requires two keys to activate it, but they can be inserted by one man who also holds down a DeadMansSwitch, preventing anyone from stopping him. When Hendrichs refuses to return Cassidy's key, it doesn't help ease tensions among the others.
* WalkingShirtlessScene: Lucien Laviscount has the best abs, [[FanService so he does several of these]].
* WeatherOfWar: Sentinel was built where the relief boat had just enough time between storms to get there and back, but far enough from Northland that the enemy doesn't have time to reach the sea fort before running into a storm. However it's pointed out that the weather has changed over forty years, so this might not still be the case.
* WheresTheKaboom: [[spoiler:Baines goes mad and tries to set off the device, only to forget the last digit of the activation code. Then Sully tries to detonate it after realising Cassidy is a Northland agent, because her country is planning to invade. Cue DistantReactionShot...and nothing happens because Baines has deactivated Martha. In the end Cassidy and Sully call a truce and agree to make sure no-one else sets it off.]]
----
Sentinel is manned by a skeleton crew of only four soldiers; the commander Sgt. Hendrichs (Creator/ThomasKretschmann); Cpl. Cassidy (Creator/KateBosworth), TheSquadette who serves as NumberTwo; TheEngineer Baines (Martin McCann), and 'Sully' Sullivan (Lucien Laviscount). Their two year contract ended three months ago, but the relief crew never arrived. Trapped in the middle of a vast and hostile ocean the crew are starting to wonder: Has war broken out again? Is there anyone still alive back home? Does the enemy even exist anymore? Or has the enemy been among them all along?
Not to be confused with the 2007 post-apocalyptic film ''Film/TheLastSentinel''.
----
!!This movie has the following tropes:
* AmbiguousSituation: [[spoiler:Did Cassidy murder Baines, or did he just go insane and drown himself like she said?]]
* ArtisticLicenseMilitary: Sentinel is chronically undermanned for a military base holding a WMD deemed crucial for the defence of the country (presumably because it's a suicide post if the device ever has to be used) with no leeway for crew falling sick or accidents. Instead of a unit of marines for the sole purpose of defence, they have a single pistol and artillery piece. While they take precautions against unknown boats approaching, there's no sonar against submarines which might travel beneath the bad weather and carry frogmen to attack Sentinel in between the storm surges. [[spoiler:The fact that there's a spy on board implies their enemy has the means to infiltrate Southland at the very least.]]
* BadVibrations: Things start to rattle and break on the ill-maintained sea fort as the storm surge approaches.
* BaitAndSwitch: [[spoiler:Every male character is presented as a potentially unstable threat to the others at one point or another. It's Cassidy, [[WomenAreWiser presented as the most reliable]], who turns out to be the most dangerous, as she's an enemy spy who's already murdered their relief crew.]]
* {{BFG}}: Sentinel's only defence is an artillery piece mounted on the roof.
* BreakHisHeartToSaveHim: Cassidy breaks the impasse with their commander by agreeing to stay on the Sentinel while Sully and Baines take the ''Aurora'' to get help. Having fallen in love with Cassidy, Sully then refuses to leave, so she tells him he was just a convenient fling for her. She apologises afterwards when they're all forced to stay.
* ChekhovsGun:
** [[spoiler:Sully asks Baines if he can shut down Martha in case Hendrichs goes mad and tries to set it off. Baines says he can do it given time, but is reluctant to commit an act of sabotage. But after Baines nearly sets off the bomb himself, he carries out Sully's request, a fact that Sully doesn't realise until he tries to set off the bomb.]]
** Part of the railing where Scully boards the ''Aurora'' from his dinghy has come loose. [[spoiler:It had been removed by the crew to allow their murderer, who was also in the dinghy, to come on board.]]
* DoomsdayDevice: [[CuteAsABouncingBetty Martha]] is a twenty megaton bomb that, if detonated, would create a tsunami big enough to wipe out Northland--and likely their own country as well, Baines suspects, making it a literal WorldWreckingWave.
* DecontaminationChamber: A mundane version; radiation emitted from Martha means the crew have to take regular iodine baths and then get hosed down afterwards. The seals on the bomb are decaying as well, meaning the radiation levels are increasing, but they're running out of iodine until they find more on the derelict relief boat.
* DeadMansSwitch: A pressure switch on the arming panel is held down by the operator while the bomb activation code is entered.
* EarAche: When Baines refuses to fire upon the ''Aurora'', Sgt. Hendrichs shoots his ear off.
* EarthThatWas
** Baines salvages toys from the ocean for a child he hasn't even seen yet, and talks about how the Borg chair he's futilely trying to restore is from Estonia, a country that no longer exists, requiring fabric panels that are no longer manufactured.
** Sully gives Cassidy a gift he found on the ''Aurora''; a silver incense globe engraved with a map of the world as it used to be. Neither of them can work out what it is.
* FaceRevealingTurn: [[spoiler:The person [[InTheHood dressed in a rain cape]] rowing out to the ''Aurora'' appears to be Baines until she turns and guns down the crew, revealing herself as Cassidy.]]
* FamilyPortraitOfCharacterization: The photo Cassidy keeps looking at is assumed to be her family back home, including a husband she is cheating on with Sully. Cassidy tells him that the person who looks like her is actually her mother; it's a photo of her parents and brother who were killed during the war. [[spoiler:It's also a CoverIdentityAnomaly when Sully realises it's raining in the photo, when all he remembers from his childhood is the constant heat from the lack of rain in Southland. That's because Cassidy grew up in Northland.]]
* FreezeFrameBonus: Sully has ''Don’t' shoot it's me'' written on his helmet (shown right before Hendrichs orders him to fire on the ''Aurora'').
* GiantWallOfWateryDoom: Sentinel is hit by a massive wall of water almost as high as the sea fort, which manages to knock it onto a slight angle.
* GhostShip: The ''Aurora'' is found drifting in the ocean with its crew missing, but stocked full of supplies and the kit of four marines. It's obviously the ship that was supposed to bring their relief three months ago, but what happened to them?
* GoneMadFromTheIsolation: Four marines isolated on a tiny sea fort in a vast ocean, three months after they should have gone home. The thought that everyone back home may have been nuked, or that their enemy never existed in the first place, doesn't help matters.
* GreenAesop: Find balance; stop fighting over resources and start working together.
* HelpImStuck: In the opening storm scene, Baines nearly drowns when he gets his hand stuck.
* HereThereBeDragons: A world map shows only two landmasses. Southland, where the protagonists are from, is marked Home Sweet Home. Northland, where the enemy is supposed to be, is marked Here Be Dragons. It's not entirely facetious as no-one's made contact with Northland for forty years, and some speculate they've all been wiped out and the government's just keeping up the pretence as a GenghisGambit.
* HopeSpot
** Cassidy convinces Hendrichs to allow two men to return home in the ''Aurora'' while the other two stay to guard the Sentinel. [[spoiler:That night Hendrichs sets the ''Aurora'' adrift and forces the crew at gunpoint to sink it with the cannon.]]
** Baines appears to recover [[spoiler:after trying to set off Martha, so Cassidy allows him to go with her on a scavenging trip. Sully takes the opportunity to look through the confidential files and finds he's dangerously unstable. Then he only sees one person in the dinghy rowing back to the Sentinel...]]
* NeverSuicide: [[spoiler:Sully goes to release Hendrichs, only to find he's apparently jumped from the window of his cell into the ocean. Only Sully hauls his body up in the net with an obvious head wound. Then Cassidy returns claiming Baines went mad and tried to walk off across the field of debris.]]
* NoBloodForPhlebotinum: Once the environment was screwed up and the world started flooding, humanity made things worse by fighting over what land and resources remained. [[spoiler:Cassidy tells Sully that the attempt to seize the Sentinel, and Southland after that, is a [[InvadingRefugees desperation gambit as her continent is sinking under the sea]].]]
* OnceMoreWithClarity: [[spoiler:When Scully realises the truth, we get a scene showing what happened to the ''Aurora''. Cassidy was on duty that night, so she paddled out in the dingy with the homing beacon to lead their relief boat away from the Sentinel, then shot the crew as they gathered at the rail to haul her on board.]]
* PoorCommunicationKills
** When boarding the GhostShip, Sully turns off his radio because he thinks the static will give him away. Because Hendrichs can't make radio contact, he arms Martha in case the ship is full of enemy commandoes.
** Hendrichs realises [[spoiler:TheMole lured away the relief ship by taking the homing beacon out in the dinghy, so he has the ''Aurora'' blown up so no-one will have a chance to leave. However he only reveals what he's found to Sully after he's been locked up by the others as a lunatic, so Sully thinks he's crazy or it's just a ruse to get himself out of his cell.]]
* ProductPlacement: A more subtle version than most; the movie is an Estonian production and the chair Baines is trying to restore is from Borg, a company based in Estonia.
* TheRadioDiesFirst: Sentinel is under RadioSilence with a satellite passing overhead to relay messages in an emergency. Sully disobeys orders and sends out a report on the ''Aurora'', only to get the same message sent back to them. They realise that not only is the satellite no longer working, but it may have been down for some time.
* RayOfHopeEnding: [[spoiler:War is likely to break out again, but Sully and Cassidy agree to defend the Sentinel against whichever side comes to claim it. And birds are supposed to have gone extinct because their migrations were ended with the sinking of the landmasses, yet swallows are seen at the end of the movie.]]
* ReassignedToAntarctica: There's indications that despite all the propaganda, and high pay offered to anyone who volunteers to spend two years on Sentinel, it's actually this trope. Sully is supposedly OnlyInItForTheMoney, but he's actually [[TradingBarsForStripes serving there to avoid an even longer prison sentence]]. Baines is psychologically unsuited for the role, but is sent [[BunnyEarsLawyer because he's an excellent engineer]]. Sgt. Hendrichs lost his entire unit in a NoodleIncident, something [[TheAtoner he blames himself for]] and apparently his superiors did as well.
* ScavengerWorld: The crew supplement their supplies by lowering a net into the ocean and catching the fish that are driven into it by the storm, as well as taking the dinghy out to the vast fields of floating debris. Both are risky operations because you have to get back to the Sentinel before the storm hits.
* SpreadingDisasterMapGraphic: In the title sequence an outline drawing of the continents gradually changes to the two remaining in a FloodedFutureWorld.
* SwordOfDamocles: Martha is a deterrent against a Northland invasion; an atomic bomb that will unleash a tsunami that will overwhelm the continent if Southland is attacked.
* TwoKeyedLock: Though not a very effective one. Martha requires two keys to activate it, but they can be inserted by one man who also holds down a DeadMansSwitch, preventing anyone from stopping him. When Hendrichs refuses to return Cassidy's key, it doesn't help ease tensions among the others.
* WalkingShirtlessScene: Lucien Laviscount has the best abs, [[FanService so he does several of these]].
* WeatherOfWar: Sentinel was built where the relief boat had just enough time between storms to get there and back, but far enough from Northland that the enemy doesn't have time to reach the sea fort before running into a storm. However it's pointed out that the weather has changed over forty years, so this might not still be the case.
* WheresTheKaboom: [[spoiler:Baines goes mad and tries to set off the device, only to forget the last digit of the activation code. Then Sully tries to detonate it after realising Cassidy is a Northland agent, because her country is planning to invade. Cue DistantReactionShot...and nothing happens because Baines has deactivated Martha. In the end Cassidy and Sully call a truce and agree to make sure no-one else sets it off.]]
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