One of the gun magazines built a water tank and used a Ransom Rest to shoot a .357 Magnum and a .45 Colt Automatic underwater to see what would happened. The back glass of the water tank was broken in both tests and the .45 jammed.
There are several videos of Glocks being fired underwater, as long as the barrel has water inside it to equal out the pressure, everything's okay. A cartridge revolver would be even better, since there's the gap between the cylinder and barrel.
I've read that Sam Colt guaranteed that his pistols could fire if they were submerged. Didn't they made caps different back then, they were waterproofed for the soldiers?
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