Film/DieHard [-[[DieHardOnAnX ON A BOAT!!]]-] One of Creator/StevenSeagal's greatest films. It was released in 1992.

Casey Ryback (Seagal) is [[AlmightyJanitor a valued cook]] on the USS ''Missouri'', which is undergoing one last party in Pearl Harbor before it goes to UsefulNotes/SanFrancisco to be decommissioned. The captain of the ship wanted Seagal to show up in his dress whites with full decorations, but he refused; he eventually said that the captain's birthday was tomorrow and he needed to make bouillabaisse for it, which lets him off the hook.

The captain's birthday is coming, and a surprise party is arranged. Food will be flown in, and so the pesky cook has to be LockedInAFreezer -- though not before the bouillabaisse is spat on and he attempts bodily harm on the XO making the plans. He is guarded by someone on orders not to let him out or listen to him. He isn't let out...

Anyhow, this is an elaborate surprise party. There is a band featuring Tommy Lee Jones and a cake containing Miss July. Everyone is allowed off shift -- though the captain didn't want that. And there's a clown car's worth of mercenaries ready to take over the ship once everyone's had enough champagne. That's right -- a hijacking!

The captain and operations officer are killed; most of the rest of the crew is locked into the forecastle, and a few other sailors get locked in the engine room. The hijackers now have control of a ship with nukes on it. It occurs to them that the kitchen, where our cook is, is not blocked off from the weapons room, so they send someone in to finish off the pesky cook...

Of course, [[ChefOfIron the pesky cook kills him first]], and leaves a bomb in a microwave when he finally escapes. He sneaks up to the captain's room, finds him dead, and finds the cake with Miss July in it, unopened. She's alive, but she's missed everything. She's also a self-proclaimed pacifist and TheLoad...

The XO then finds the cook's service record, which had been locked in the Captain's "eyes only" safe. When they do find it, they learn that he was a Navy SEAL, one of the best ever, who, after a [[http://en.wikipedia.org/wiki/Operation_Nifty_Package#Military_execution mission in Panama]] went wrong, lost all his ranks, leaving him only qualified to be a yeoman -- or a cook. Unfortunately for them, he still has the ''skills'' of a SEAL...

They try to keep to the plan anyway -- the plan being to transfer the nukes to a sub that the CIA thought had been destroyed by mercenaries. The leader of the mercenaries in question is the band leader helping with the hijacking.

Good triumphs eventually, but it triumphs messily.

It has a sequel, ''Film/UnderSiege2DarkTerritory'' (1995).

!!Tropes that appear in the film series:

* ActionGirl: Jordan starts off as a quivering mess but evolves into this trope.
* AffablyEvil: Strannix is very much this, before his VillainousBreakdown.
-->'''Strannix:''' (looking at the carnage Ryback has left behind) Doumer, Doumer, Doumer... why didn't you ''hire'' this person? I don't know what his price would have been but it would have been ''worth'' it.
* AlmightyJanitor:
** An US Navy Ship hijacking is almost single-handedly thwarted by... said ship's [[ChefOfIron cook]]. Well, he used to be a Navy SEAL, but still.
** Midway through the film, Ryback is aided by a small group of sailors who had been assigned to mundane tasks before the takeover (such as running ships laundry service) and had minimal combat training. [[spoiler: They take out Krill and his sub with no effort.]]
* ArtisticLicenseShips: In various scenes is perfectly clear, that ship is disguised USS Alabama, with its shorter hull and single stack. Radars on artillery directors is older model too. Also, on Iowa-class battleships pilot house is located inside armored conning tower, what appears as (and depicted in movie) control room is just enclosed gallery around around said conning tower.
* AxCrazy: Krill is not exactly the most stable guy around, which even the captain had noted long before he is inevitably murdered.
** Strannix too, but not half as much as Krill. He at least ''tries'' to be professional for most of the film.
* BaitAndSwitchGunshot: As Doumer is about to shoot Chief Ryback, several shots ring out and Doumer falls to the deck dead. Behind him is standing Jordan Tate, Ryback's {{Love Interest|s}}, with a gun in her hands.
* BerserkButton: It's not really a good idea to spit in Ryback's soup. He takes it kind of personally.
* {{BFG}}: The 16" guns of the Missouri. Which Ryback uses to sink the sub.
* BigBad: Strannix, who hijacks the Missouri with the intent of selling its nuclear warheads.
* BigGood: Admiral Bates is presented as this in both films. He's of the Joint Chiefs of Staff, and takes control of HQ for the good guys. In the first film, he's already there, and in the second he is the first senior person of authority called.
* BittersweetEnding: The heroes win, but a lot of good sailors die in the process. The film closes on the captain's funeral - not the most triumphant note to end on.
* BondOneLiner: "Keep the faith, [[spoiler:Strannix]]."
* BrickJoke: Jordan Tate has a [[ThouShaltNotKill rule]] about killing. Actually, she has two rules: One, she does not date musicians, and Two, [[ActualPacifist SHE DOES NOT KILL PEOPLE]]. Later, though, she saves Ryback's bacon with a ConvenientlyTimedAttackFromBehind.
-->'''Ryback:''' Next thing I know, you'll be dating musicians.
* BringIt: Strannix to Chief Ryback during their knife fight.
* BullyingTheDragon: Krill is constantly making trouble for Ryback, which proves to be a foolish mistake on his part when he learns only after the killing has started that Ryback is indeed a professional killing machine as Strannix suspected.
* CaptainObvious: Admiral Bates declaring "We gotta lot of trouble on that ship" when he's just finished talking with Ryback in the middle of a heated gunfight is certainly redundant.
* ChekhovsGun: At the beginning of the movie we see Ryback showing off his skills with a throwing knife, which is left stuck in a target. Later, when the ship has been taken over and Ryback has to escape from the kitchen, he uses that same knife to silently dispose of a mook. And later on, when Strannix and his henchmen find the bodies in the kitchen, this knife gives Strannix the first sign that the cook may be more threatening than they thought, prompting him to search Ryback's files.
* ChefOfIron: ''And how!'' Seagal's character is obviously not to be messed with.
* TheChosenZero: Ryback is a ''hilarious'' subversion. He's just the ship's cook, and very honest about it... but he used to be one of the greatest SEALs the Navy had ever seen.
* CIAEvilFBIGood: While not the FBI, the dichotomy between CIA and Navy staff when handling the crisis of each movie plays out the same. CIA liaisons are always presented as [[SmugSnake self serving]], irresponsible, short sighted, and [[CreateYourOwnVillain responsible for the creation of the villains]], and the Navy as as an exasperated ReasonableAuthorityFigure that has to clean up after them with the help of Ryback.
* ConvenientlyTimedAttackFromBehind: Combined with BaitAndSwitchGunshot when Jordan saves Ryback from Doumer.
* CreepyCrossdresser: At the Captain's birthday party, Krill comes into the party in drag, much to the surprise of his crewmates. Turns out he's in on the hijacking.
* CutHimselfShaving: Commander Krill says he cut himself shaving as an explanation for Ryback slashing his face. It was a better story than saying that he put Ryback in the kitchen storage.
* DaChief: Averted by Admiral Bates in the first film. Upon finding out that Ryback has ignored his orders to avoid contact if possible and is busy trying to kill all the terrorists himself, the Admiral's response is thus:
-->'''Chief Ryback:''' I'm sorry, sir, you can court-martial me if I live, sir!
-->'''Admiral Bates:''' All right, Chief... you are hereby authorized to do whatever is necessary to regain control of that vessel. Because if I can't control you, I might as well at least ''support'' you!
* DarkenedBuildingShootout: More like Darkened Ship Interior shootout, but the same principle applies.
* DefensiveFeintTrap
* DidntSeeThatComing: The reaction of the bad guys when they discover the cook just happens to be a highly trained and decorated SEAL. Krill even lampshades it with "how little I knew."
* DieHardOnAnX
** First movie: Boat!
** Second movie: Train!
* DistractedByTheSexy: Averted during a memorable sequence in which Jordan bursts out of a cake, topless, wearing a naval officer's coat and a thong. Although Ryback's attention is diverted, he's still in control of the situation and quickly takes charge.
* DoesntLikeGuns: Casey claims he doesn't like guns and so does Jordan, but both end up using firearms. Casey is generally more at home using knives.
** [[InformedAbility Doesn't stop him]] [[CrazyPrepared carrying a .45 with him at all times in the second film.]]
*** There's a difference between doing something becouse you want to or becouse you think you have to.
* TheDragon: Krill in the first film, being Strannix's inside man and deputy across the operation
* DragonInChief: Implied in both films, with Krill in the first and Penn in the second successfully intimidating their employers with threats when the operation is threatening to fall behind schedule.
* EveryoneKnowsMorse: In the first movie, Ryback is able to rescue a group of survivors trapped behind a welded-shut hatch who just happened to be broadcasting Morse code as he was nearby. Somewhat justified in that he was previously a Navy SEAL.
* EvilIsHammy: Creator/TommyLeeJones (Strannix) and Creator/GaryBusey (Krill) look like they're having an absolute blast in the first movie. Jones in particular is complete over the top villainous awesome.
* EyeScream: Ryback gouges out [[spoiler:Strannix's]] eye before killing him off.
* FingerInTheMail: Strannix recounts a tale of how he sent his CIA superior the fingers of two assassins who were sent to kill him.
* {{Foreshadowing}}: Captain Adams to Ryback: "You know, if I had your ribbons, I'd wear 'em to bed," hinting that there's much more than meets the eye here (as if his being the main character didn't already).
** And we see at the end that Ryback's broad chest is indeed laden with decorations.
** When the TV news commentator is talking about how the ''Missouri'' is on it's last cruise to San Francisco for decommissioning, he remarks that "her awesome weaponry will be removed and dismantled, probably never to be fired again." By the end of the film, just about all of her major weapons systems (20mm CIWS, 5" and 16" guns, and Harpoon and Tomahawk missiles) have been fired at least once.
* HarsherInHindsight: In-universe. Due to age and rank of Captain Adams it is safe to assume that he was on his last assignment, just like battleship itself. Unfortunately, he would not survive events. In RealLife, actor Patrick O'Neal died after just two years after this movie, seventeen days short of his 67th birthday.
* HiddenDepths: Jordan turns out to have more guts than most of the crew.
* InvincibleHero: A common complaint for the films is that, unlike Bruce Willis in ''Film/DieHard'', Seagal's Ryback disposes of everyone -- mooks, TheDragon, the BigBad -- without breaking a sweat or losing the cool facade, which tends to suck out some of the potential drama or excitement.
** The crazy thing is that it's ''significantly'' toned down from Segal's usual characters. Ryback is far less respected than the standard Seagal protagonist, he gets injured twice, has to be saved by the ActionGirl at one point, and needs the help of a small band of escaped sailors to save the day.
* IResembleThatRemark: As [[TheMole Commander Krill]] reads through his now-dead superior's report on him, he notices that he pegged Krill for being psychologically unstable. Krill, in drag, asks [[BigBad Strannix]] if he looks like he needs psychological help.
-->'''Strannix:''' [[SarcasmMode "Not at all".]]
* JumpingOutOfACake: At the beginning.
* KindaBusyHere: Casey Ryback is shooting it out with the hijackers when he gets a call from [[ReasonableAuthorityFigure Admiral Bates]], and his female sidekick answers.
-->'''Admiral Bates:''' "I'm trying to get ahold of Ryback."
-->'''Jordan Tate:''' "He's in a gunfight. I'll have to take a message."
* KarmicDeath: If you think about, Commander Krill being blown to kingdom come, by the guns of the ship, who's crew he betrayed can be considered this.
* KlingonPromotion: Invoked by Commander Krill. Once he has TheCaptain taken out, he starts wearing his rank markings once the ship's hijacking has been completed. It's put down to his LimitedAdvancementOpportunities, so he's shown to be hugely upset that he is unlikely to actually become a Captain legitimately.
* KnifeFight: The climax has a knife fight between Strannix and Ryback, [[spoiler: which quickly turns into a CurbStompBattle, with Strannix only getting one luck scratch, before Ryback [[EyeScream gauges his eye out with his bare hand]], before [[ThereIsNoKillLikeOverkill stabbing him through the head and smashing his head through a piece of equipment, electrocuting him]]. And that's ''after'' owning him in the knife fight.]]
* TheLoad: Jordan, although [[AdrenalineMakeover she shows]] ActionGirl [[AdrenalineMakeover potential]] in the last 20 minutes of the film. She's also pretty clever. He tells her to stay back "where it's safe". Her reply, "The safest place on this ship is three feet behind you!"
* MacGyvering: Ryback improvises explosives and other tools using a combination of everyday objects like paint thinner and military implements like gunpowder from a grenade.
* TheMole: Kryll, within the ship, until the takeover starts.
* MotiveMisidentification: The Pentagon think Strannix has gone insane and is planning to just launch the ship's missiles at random thanks to his act. It takes Ryback's phone call for them to realize Strannix is quite sane and is planning to steal and sell the nuclear arsenal on the black market.
* MsFanservice: We are introduced to Jordan when she jumps out of a cake in a thong and naval officer's coat which she quickly strips off to reveal a great pair of tits.
* NeverBringAKnifeToAFistFight: Unless you want Ryback to take it from you and shove it into your skull.
* NoodleIncident: How and when Ryback and Strannix met previously.
* NotSoDifferent: Flipped around, from Seagal's protagonist to Jones' antagonist.
--> '''Ryback:''' "We're the same, you and I."
* ANuclearError
** Averted when it's stated that hitting nukes with high explosives won't set them off.
** Played straight when a self-destruct code transmitted to a cruise missile in flight causes it to blow up.
*** It should be noted, that the nuke didn't go nuclear, it just detonated its self destruct and fell from the sky.
* ObfuscatingInsanity: Strannix uses this when dealing with the brass monitoring the hijacking to misdirect them from his true motives.
* OhCrap: Seal Team 5 when faced with a heatseeker-wielding mook aiming at their helicopter. Ryback and his gang watching the same scene from too far away to assist.
** Also a couple of Strannix's men when they realize Ryback is a former SEAL.
-->'''Doumer:''' "Goddamn cook's a ''SEAL''!?"
** Krill's face is priceless when he realizes the last shell fired from the ''Missouri'' is going to hit the submarine he's in.
** As Ryback and his crew are celebrating and watching the submarine burn, their grins and laughter are instantly replaced with looks of horror when a pair of Tomahawks blast off of their launchers.
* OurPresidentsAreDifferent: Subverted in that the real president at the time, UsefulNotes/GeorgeHWBush, is shown sending the ship off before its final voyage, even if he's not involved in the bulk of the movie.
* OverrankedSoldier: Commander Krill is a mix of type IV-V, harassing and provoking crew members he doesn't like for no real reason, often in ways that blatantly violate Navy regulations. To be fair, Captain Adams had noticed his XO's instability, and after the terrorists take the ''Missouri'', they find he had prepared a performance review for Krill that would have torpedoed Krill's career over that had Adams lived to reach Pearl Harbor and file it.
* PerformerGuise: Some of the terrorists infiltrating the U.S.S. Missouri dress up and perform as musicians during a party for the ship's captain.
* PointDefenseless: Averted when the CIWS easily takes out the F/A-18 on its recon mission. Justified when Tackman's and Ryback's sabotage cripples the ''Missouri's'' electronics before they can shoot down the SEAL team's choppers, then subverted when they get shot down anyway by a pair of missileers on the submarine armed with Stingers.
* PrettyLittleHeadshots: While there is some brutal violence, the headshots (most notably in the first film) are clean and leave small, relatively bloodless holes.
* PsychoSupporter: Krill is the crazier of the two in command of the takeover... at least up until he dies.
* RagtagBunchOfMisfits: Ryback frees a handful of sailors who are instrumental in saving the day, but they don't quite reach FiveManBand status.
* RatedMForManly: Creator/StevenSeagal, [[MoreDakka firefights]], [[StuffBlowingUp explosions]], [[EvilIsHammy hammy villains]], [[{{Fanservice}} Erika Eleniak's boobs]]...
* RealMenCanCook: Casey is an excellent chef, and is only questioned by [[TheDragon Krill]].
* ReasonableAuthorityFigure: Admiral Bates in 1 and 2.
-->'''Adm. Bates:''' ''[talking to Ryback on the radio, who is in a gunfight with the bad guys]]'' I see you have disobeyed my orders.\\
'''Ryback:''' ''[fires his machine gun]'' I'm sorry, sir. You can court-martial me if I live, sir.\\
'''Adm. Bates:''' I see. Well, since your ass is on the line, Sailor, I authorize you right now to do whatever you can to save the crew and aid in the arrival of the SEAL team. Because if I [[PrecisionFStrike Goddamn]] can't CONTROL you, I might as well SUPPORT you.
* RedshirtArmy: The navy SEAL team sent to retake the ship is wiped out when their helicopter is shot down. Any other crewman trying to be a hero other than Ryback and his companions doesn't gets to survive for long, either.
* SentryGun: The Phalanx CIWS aboard the ''Missouri''.
* ShoutOut: Strannix and the submarine crew use names like "Roadrunner" and "Wile E. Coyote" as codenames, referencing the classic Warner Bros. cartoons. Guess which studio ''Under Siege'' is from.
* SpannerInTheWorks: The villains have carefully planned this entire thing out, prepared to take on everything from Navy reinforcements to rebellion among the crew...but never considered how the ''cook'' might just be the most capable warrior on the entire ship.
* SpitefulSpit: In his first scene, Krill shows his contempt towards Ryback by spitting on the ''bouillabaisse'' he was preparing. Ryback [[BerserkButton doesn't take it well]] and punches Krill right in the mug.
* StandardEvilOrganizationSquad: The bad guys are just a DarkChick short of being a FiveBadBand.
** BigBad: Strannix
** TheDragon: Cmdr. Krill
** TheBrute: Doumer
** EvilGenius: Pitt
* StuffBlowingUp
* TakingYouWithMe: When Krill dies and Strannix [[VillainousBreakdown loses it]], the latter knows his plan is already doomed, so he launches the nuke towards the nearest city, Honolulu.
* TooDumbToLive: The marine assigned to guard Ryback in the meat locker fails to recognize numerous warning signs the ship is under attack, despite Ryback pointing them out, until it's too late.
* TookALevelInBadass: Jordan Tate changes from TheLoad to an ActionGirl when she pulls a BaitAndSwitchGunshot to save Ryback's life.
* VillainousBreakdown: Strannix goes completely insane after Krill is killed and his eardrums burst due to the shockwave from the Missouri's 16" guns firing. He proceeds to launch two Tomahawk missiles at Honolulu while babbling about cartoon characters.
* VillainousFriendship: Strannix, Commander Krill, and Daumer all seem to have fun time together.
* VillainBall: Ruthlessly {{Averted|Trope}}. Prior to the VillainousBreakdown both Strannix and Krill refuse to pick up the ball, with the worst decisions being the incident where Krill provokes Rybeck and throws him in the meat locker (which is petty and stupid, but he had no way of knowing that this could impact his plan) and only sending a couple men to the kitchen at the start (which is understandable as they had no idea how dangerous Ryback was). After that, Strannix orders his men into roving patrols, reporting in regularly, not to pursue Ryback into unsecured areas, to immediately call for backup should anything happen, the sub has backup anti-air weapons used to take out the SEAL Team, Krill smartly figures that putting the crew in danger will create a situation where they can take out Ryback, and they notice Ryback trying to sabotage the submarine.
* WhyDontYouJustShootHim: Near the end of the movie, Strannix gets the drop on Ryback by sneaking up behind him, but doesn't shoot him because...reasons? It's clear the only reason for this is the director wanted a climactic knife fight between the two of them.