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Hot Sub-on-Sub Action
In the long history of submarines being used in warfare, which goes back at least to 1775... how many times do you think a submerged submarine has sunk another submerged submarine? 500? 200? 100? 50? 10?

Actually, just once, during Operation Caesar in World War II, when HMS Venturer sank U-864. (Good thing for the Allies too, since the U-864 was transporting advanced technology to Japan). A second example, lacking citation, involves the captured German U-Boat later re-launched as HMS Morse. The Morse was used by the Royal Navy to patrol the sea lanes leading back to the German home bases in western France, the intention being for returning German U-Boats, relaxing security on the last stage home, to see nothing more than a friendly submarine. Which would then run up the White Ensign and fire a spread of torpedoes at them. The Morse sank several U-Boats in surface attacks and may have made one kill while submerged.

But if you were to believe Hollywood, it's a regular occurrence. No matter what war, or what type of subs are involved... they will be fighting underwater.

During World War I and World War II, submarines were almost entirely episodically submersible torpedo boats, obliged to run on the surface using their air-breathing engines (mostly diesel-electric propulsion systems) for higher speed, greater endurance, and to charge the batteries that allowed them to maintain steerage and very slow speeds underwater. While surfaced, submarines were just as vulnerable to torpedo attacks made by submerged enemy submarines as any other vessel, but because of their lower profiles (small conning towers, decks almost awash) were difficult to detect visually, and thus rarely attacked by enemy submarines.

Of the 52 submarines lost by the U.S. Navy in World War II, at least one - the USS Corvina (SS-226) - was confirmed torpedoed and sunk by a Japanese submarine while running on the surface, while the Japanese lost five submarines to American submarine attacks. Three of the Japanese losses, all of them small RO-class boats, were credited to the USS Batfish during a single three-day period in February 1945. Two U-boat kills were also credited to American submarines, one being during WWI. Neither was confirmed.

However, whilst the crew of the HMS Venturer only had paper, pencils and decent maths skills to plot a firing solution, modern subs have computers and advanced homing torpedoes - had the Cold War turned hot after the 1960s (not before then), there certainly would have been underwater submarine battles—and in fairness, that is when a large number of such sub battles are set (thank you, Tom Clancy!). NATO and Warsaw Pact submarines followed each other about all the time. Current American naval doctrine is to have each carrier battle group (structured around a Nimitz- or Gerald Ford class supercarrier) accompanied by two nuclear attack submarines (SSN) which include enemy sub-killing in their tasking - these are generally known as "Hunter-Killer" submarines.

Examples:

Anime and Manga
  • Submarine 707 R (Mission 2)
  • The Silent Service
  • Cyborg 009 features a scene where the team's mobile base is being pursued separately by both an American and Soviet sub. The heroes make their getaway when the two subs notice each other and begin fighting.
  • Blue Sub 6, although it's less sub on sub and more sub on monster whales.
  • Full Metal Panic!: The last episodes of season 1 feature the huge submarine from which the hero operate trying to and succeeding in evading an American Los Angeles class submarine captained by an officer obsessed with Mithril's mythical submarine unofficially called "Toy Box". While the Tuatha de Danaan doesn't fire a single torpedo, the Americans on the other hand do, she (and it's a definite she at that point as the "female" AI commanding it was linked to the shows resident tsundere Kaname Chidori) does get to pull some very impressive maneuvers verging on the impossible for such a huge sub, and forces the American sub to the surface.
  • The submarine I-401 from Arpeggio of Blue Steel managed to destroy an underwater submarine while under fire by the cruiser Takao, though to be fair I-401 used a Wave Motion Gun to achieve it.

Film
  • The Hunt for Red October is the Trope Codifier.
  • Crimson Tide
  • U-571 does this, with the Americans in the captured German U-Boat destroying another submerged German U-Boat with torpedoes.
  • G.I. Joe: The Rise of Cobra features what amounts to a dogfight UNDER WATER!
  • Down Periscope involves a wargame that tests if a rogue World War II-era diesel submarine, run by a Ragtag Bunch of Misfits, is capable of outmaneuvering the US Navy and cause significant damage to major ports. The diesel's main opponent? A Los Angeles class nuclear attack sub. The exercise included two simulated attacks on naval ports where the diesel sub is assumed to do significant damage. The first attack has a scene where the old boat surfaces and launches flares (stand-ins for actual weapons) in sight of two admirals eating dinner. The second one was where Admiral Winslow (Rip Torn) authorised the use of live torpedoes by Lt Commander Tom Dodge (Kelsey Grammer), in place of the flares.
  • The Abyss deserves a mention here. The minisubs involved aren't fighting with weapons- they're fighting over a weapon.
  • Another particularly brutal minisub duel occurs in the James Bond film For Your Eyes Only. The bad guy's sub was actually piloted by the man who designed it, Graham Hawkes, who, amusingly, tried so hard to make the fight scene realistic (having been ordered to by the director, despite his earlier protests it was unsafe) that he almost killed Roger Moore's stunt double.
  • Run Silent Run Deep depends on, and arguably laid the groundwork for this trope since it turns out the Japanese vessel taking out American subs in the Bungo Straits is not a surface vessel, but another submarine.
    • It is torpedoed when it is lured to the surface rather then under the surface. The original writer was a submariner himself and knew perfectly well that it was pretty much impossible for one submerged submarine to torpedo another in World War II.
  • In Enemy Hands features several undersea battles with American and German submarines in the closing days of World War II.

Literature
  • Several of the Jack Ryan books give a significant focus to submarine operations, in particular The Hunt for Red October and The Sum of All Fears.
  • One of the primary plots of Red Storm Rising is the second Battle of the Atlantic during a non-nuclear World War III, with a significant focus on the efforts of the USS Chicago (SSN-721) and other NATO submarines against the Soviet surface and submarine fleets.
  • There's a sub v. sub fight in, of all places, Zombie Apocalypse novel World War Z. And no, neither sub was piloted by Zombies. If they were, this entry would be on the Crowning Moment Of Awesome page. The subs involved were both nuclear submarines crewed by loyalist and renegade members of the Chinese Navy as China was being torn apart by both the zombie epidemic and a civil war. The renegade sub won, and then proceeded to nuke the Politburo to end the civil war.
  • The Dragon In The Sea (AKA Under Pressure) by Frank Herbert depicts tense underwater combat Twenty Minutes into the Future between nuclear submarines. Despite being published in 1956 it has survived the ravages of Science Marches On and Zeerust remarkable well.
  • Fyodor Berezon's novel Incoming Cataclysm features an all-out battle between two modern carrier battle groups. A rip in space/time results in an entire carrier battle group crossing over from a parallel world. The ships belong to an alternate Soviet Union, which dominates much of the alternate world thanks to Operation Barbarossa being delayed by a month. Our world's US Navy decides to engage the "invaders" (who have no idea they crossed over and think they're fighting their Americans). The battle results in the loss of two supercarriers (one American and one Soviet). Since the rip was (in part) powered by the presence of active nuclear reactors, the remaining Soviet ships disappeared. However, a super-advanced Soviet nuclear submarine remained and proceeded out of the area. One of this trope's actions results when a Russian submarine decides to investigate the area and gets sunk by an American sub, which was looking for the Soviet one. When an American sub later detects the Soviet one (whose sonar is weaker), it launches torpedoes at it. The Soviets dive to a depth that is crushing for our world's submersibles but not to its enhanced hull, resulting in the torpedoes being crushed. It retaliates by launching nuclear-tipped torpedoes at the foe. The American sub manages to evade them, but the resulting pressure wave damages the boat, causing it to sink past crush depth. Both engagements are very quick.

Live-Action TV
  • SeaQuest DSV, in its third season had actual ''sub fighters'' - the Specter-class for the UEO forces, and a host of other types for various bad guys forces.
    • The Chao Dai (Vietnamese) actually have the best sub-fighter pilots, since they have brain implants that jack into the sub-fighters and control the craft by thought. During the one episode they're shown, they manage to destroy one of the SeaQuest sub-fighters, piloted by a semi-regular character. She is promptly replaced by a rogue Chao Dai female pilot. Yes, they kill off one Twofer Token Minority (a black woman) to immediately replace her with another. This was the last episode before the series was cancelled, though.
    • There was also an episode where the seaQuest ended up in the past during the Cuban Missile Crisis. They found out that an American submarine was positioned in the wrong place and would attack a Soviet ship because they would assume it would cross the Naval Blockade. They fire torpedoes at the seaQuest, who use futuristic interceptor torpedoes to destroy them. Confused, the Americans deploy a distress beacon, which would also trigger a war. Luckily, Darwin manages to disable the beacon.
    • In fact, it even happens in the pilot episode, when Bridger commands SeaQuest in an underwater duel with a submarine captained by his rogue former protege.
  • Seen on Last Resort as the US Navy think the USS Colorado has gone rogue and is expending every effort to recapture or sink her, and the best way to do that is with attack subs.
  • In the Thunderbirds episode "Desperate Intruder", Thunderbird 4 engages The Hood's submarine in combat and sinks it.

Video Games
  • In The Hunt is practically made of this about half the time. You play a sub, and you shoot down enemy subs... and planes, robots, a dragon-snail, and a Living Statue.
  • Final Fantasy VII has a minigame where you pilot a submarine to seek and destroy another submarine.
  • Red Faction had a submarine-on-submarine section with ridiculously clear water.
    • So did Red Faction II. (To be fair, it also had an underwater base you needed to infiltrate.)
  • The classic sub simulator 688AttackSub features several Cold War-era missions that involve sub-on-sub combat.
  • Submarine Titans, a real-time strategy game taking place underwater with subs. Combat occurs at close range, but stray torpedoes can hit targets at a distance.
  • Sid Meier also did a game version of Red Storm Rising, which, like the novel mentioned above, has plenty of this.
    • Completely averted in the sequel, though. Japanese subs didn't even have any sprites.
    • Also averted in the NES version - there were no other subs. The %@&! kaiboken, on the other hand...
  • Dangerous Waters.
  • The Aquanox series is basically a space combat sim underwater, involves a lot of dogfights, mostly using futuristic weapons, complemented with occasional torpedo launches. Unlike actual submarines, most subs featured in the series were all single-pilot with a cockpit. In a bit of realism, there was a way to instantly kill another sub by shooting out the thin cockpit glass with a sniper-like weapon, causing the other sub to implode. Strangely though, hitting the same glass with a much more powerful weapon would not necessarily have the same effect.
  • PS1 game Critical Depth was basically Twisted Metal UNDERWATER. Subs ranged from a wooden pirate sub with cannons to a converted private jet. It was not very realistic.
  • X-Com: Terror From The Deep had this when intercepting alien craft. Then again, all of the alien races from this installment of the X-Com series were amphibious, traveled around in weird-looking submarines, and came from a colony ship that crashed some 65 million years ago.
    • Also, for the sake of completeness, the submarines in the game are flying submarines. That's right: sufficient velocity to break the surface of the water means you can activate turbo jets and fly! Weapons only work underwater though (which generally makes sense: torpedoes don't have the right engines, the powerful sonic cannon apparently has vastly decreased range when you're traveling faster than the speed of sound, and the omni-powerful Pulse Wave Torpedo actually requires water to work properly).
  • Supreme Commander features submarines as an entry level navel unit, but due to the lack of decent anti-submarine weapons, they tend to be used in massed fleets late game. The only real counter to these fleets are more submarines as destroyers(the anti-submarine boat) are simply to expensive to produce in large numbers and torpedo bombers (the anti-submarine aircraft) are vulnerable to anti-aircraft surface fire.
    • The Forged Alliance expansion pack adds submarine hunters for each of the factions as a counter to this. The submarine hunters tend to be effective against against submerged targets but are vulnerable to to surface warships.
  • Warship Gunner 2 allows you to engage enemy subs underwater if you're controlling a submarine. Note that you are completely Point Defenseless while submerged and submarines usually attack with torpedoes.
  • Pretty much averted in Warcraft 2. Submarines and sea turtles must surface to fire and can only be fired upon if a flying unit (griffon, dragon, helicopter, or zeppelin) can see them.
  • In Command & Conquer: Yuri's Revenge, the Soviets and Yuri's forces have submarines, except a fight between them involves floating in place while shooting one torpedo after another until either is destroyed. The Allies only have surface ships and trained dolphins.
    • Red Alert 3 gives Akula submarines to the Soviets and smaller Yari mini-subs which can perform kamikaze attacks to the Empire. The Imperial Sea-Wing is also underwater, but doesn't count because it is anti-air only in that state. The Allies are again left with dolphins.
  • The old Origin game Subwars 2050 was an action/simulator of submarine combat where submarines are purposely built with aerodynamic, jetfighter-like hulls for better maneuverability. Oddly in-game this doesn't play out so much as the game isn't so much a big dogfight as it's about deciding when to switch from passive to active sonar and launching guided torpedoes at the enemy from a range that's too close for them to evade from.
  • Steel Diver is a submarine action/simulation hybrid that bends a few rules of reality, and has some submarines as enemies.
  • In Advance Wars, sub-sub fights are quite common because submerged subs can only be attacked by cruisers and other subs. Given that cruisers are not constantly invisible and very vulnerable to battleships and bombers, they tend to be prime targets of opportunity and generally die quicker than subs. A sub attacking another sub will do between 55-65% damage; most sub battles end up with 8 HP on the attacker and 4 on the defender.

Web Comics
  • Archipelago has a few submarine battles, although most are implied, with only one actually seen in the story so far. It was, however, epic, and involved grappling onto and then boarding the other sub. Without surfacing.
    • Justified, as this section of the world consists entirely of scattered islands, and submarine is the routine method of travel. Warfare between submarines would be more common.

Western Animation


Sub StoryTropes At SeaWooden Ships and Iron Men
Going Down with the ShipSeaborne And Submersible VehiclesHouseboat Hero
Hollywood TacticsMilitary and Warfare TropesHow to Survive a War Movie

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