Can a bullet be fired underwater?

A gun may work one or two times when fired underwater, but in the long run, water will seep into the gun or wet the crucial parts of it, making it completely useless. And then there's the actual water pressure itself, which means the bullet won't go very far.

tvtropes.org - Guns Firing Underwater - TV Tropes

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http://tvtropes.org/pmwiki/pmwiki.php/Main/GunsFiringUnderwater

In fiction, guns can be practically drowned in water and still fire accurately, if not a little worse for wear. It doesn't matter who's holding the gun — The Hero or the Big Bad , they can still fire completely accurately, despite the fact that Guns Do Not Work That Way In Real Life, this trope can vary. Most guns will jam or misfire when people discharge them underwater. It's not the gun itself that is affected (well, not for the first time, anyway) — it's the ammunition itself. Even if the gun is somewhat water-resistant (and that's a big somewhat, given that the barrel of a gun is essentially a giant hole), the primer of the ammunition is not. Besides the possibility of the primer being waterlogged, the gun's inner workings could also end up corroded by the water, and attempting to fire a corroded gun is a Very Bad Idea. A gun may work one or two times when fired underwater, but in the long run, water will seep into the gun or wet the crucial parts of it, making it completely useless. And then there's the actual water pressure itself, which means the bullet won't go very far. However, there are some guns that have been designed to work underwater. These include the Heckler and Koch P11 pistol and the APS Underwater Assault Rifle. Also a case of Do Not Try This at Home, because guns are not intended to be fired underwater. Shooting a gun filled with water or wet ammunition is probably not going to end well for you or anyone around you. And shooting a gun underwater with air in its barrel is even worse, because the gun can explode. Subtrope of Water Is Air, because the bullets will still work fine though they just won't travel very far. Spearguns designed for fishing underwater are also common in the hands of divers and underwater Mooks.

Examples:

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Anime and Manga

In Black Lagoon, Revy gratefully takes an APS Underwater rifle from Balalaika, who used her military connections to the newly restructured Russian military to acquire it. She notably uses it during the Das Wieder Erstehen Des Adlers/Die Rückkehr des Adlers story when the APS is used against Aryan Socialist Union forces raiding a wrecked U-Boat. One of Leiji Matsumoto's short war stories depicts what happens when a rifle is waterlogged. A Japanese soldier, having been rescued from the sea, shoots the sole surviving crewman of a recently destroyed American submarine that sank his transport ship. The Japanese rifle, having gotten seawater down the barrel, manages to spit out the water along with the bullet. The bullet is slowed down by the water and only gives the intended victim a nasty bump on the head. To the credit of the Type 99 short rifle in question, the barrel's chrome-lined bore doesn't suffer any corrosion.

Comic Books

In Jon Sable, Freelance, Jon's .357 Magnum pepperbox a Swiss-Army Weapon can fire underwater; usually firing steel spikes like a miniature spear gun. Justified as this is a gun specifically designed to fire underwater, being based on a prototype weapon designed for the Navy SEALs.

Films — Live-Action

John Wick: Chapter 3 Parabellum: John Wick and a Mook fall into a pool during the battle of the Continetal. The mook tries to shoot Wick, but the bullets do not reach him and he shoots the mook point blank instead. Jurassic World: Fallen Kingdom: Claire and Franklin are trapped in a leaking "hamster ball" under water. Owen fires his gun at the ball to help them escape, and it actually works until he gets hit by a blob of lava and drops his gun. Lethal Weapon 4: Martin Riggs kills Wah Sing Ku by shooting him point blank with an assault rifle after throwing him into the water. The climactic fight of Mindhunters downplays this: the heroine and the Serial Killer Big Bad both pack Glocks and both shoot at each other while struggling underwater, but while the Glocks shoot all right, the bullets just lose all of their velocity the moment they leave the barrel. The two of them are then forced to keep the guns out of the water and the fight then becomes a test to see who can hold their breath the longest, with the stakes of the loser being shot the moment they have to emerge. U.S. Marshals: While a pistol is not actually fired underwater, Sam Gerald makes mention of Glocks being capable of doing this as one of the reasons he loves his sidearm.

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Live-Action TV

Tested by the MythBusters. Even if a gun does fire, the water will slow a bullet down to nonlethal speed in short order.

Video Games

Tabletop Games

Pathfinder: Firearms can't be used underwater unless protected with specific magic, and even then, shooting through water imposes a stiff penalty on the weapon's accuracy. Early ammunition is ruined outright by exposure to water. Shadowrun: Averted, as there are rules for how bullets work underwater (generally, they don't) and there are a few weapons that have been specifically designed for underwater combat, including a carbine. Played with in Blue Planet; most modern guns use electrically-ignited binary propellants and work just fine underwater, or can be made to with a minimum of fuss. (Corrosion's a problem, but it happens on land too.) That being said, water pressure does horrible things to external ballistics; range penalties pile up fast, on top of a penalty for being underwater at all.

Western Animation

Not conventional guns, but in Star Wars: The Clone Wars blasters are shown being used underwater during the Battle of Mon Calamari, as are lightsabers. Somehow the energy doesn't dissipate into the water until it hits a target.

Real Life

tvtropes.org - Guns Firing Underwater - TV Tropes

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