Can guns fire under water?

yes, revolvers will fire under water as the bullet is water tight, and the simplified operation of a revolver makes it possible, the only thing is that water slows the bullet significantly, and can sometimes cause the barrel to rupture, but depending on the gun, it will still function, semi automatics on the other had- have a harder time, the first shot will go off, but having the gun under water will create more resistance and the slide may not cycle completely or at all.

I'm somewhat amazed that the bullet was still fast & strong enough underwater to break the handcuffs. Perhaps the handcuffs got weaker while wet or under the water's pressure, but I can't really say as I didn't have 2 take physical science 2 get my Associate's degree.

I also just saw a gun fired underwater in "Cliffhanger." Not only is that possible, but Sylvester Stallone can do a lot of stuff underwater in a frozen pond except go n2 hypothermia w/n a minute!

Mythbusters said "yes, they can", though the bullets will have some decrease in speed etc.

The Sheriff holsters a hand gun in his boot when he goes after the
robbers - seems a stupid place to put a gun during a flood . . . .

Driver, Slater & Freeman are a bit wasted in this, but it's the wettest
movie I think I've ever seen. Mind you, Bladerunner was pretty
torrential.

i was more interested in knowing how a 6 shooter could fire 20 times without reloading