>>As to your second question, shooting a gun under water isn’t much different than shooting on land.
quote:
the water in the barrel of the gun would block the bullet causing the gun to explode
No more than the air in the barrel would block a bullet; the bullet has to travel through the medium of water just as it has to travel through the medium of air, pushing either medium aside as it goes. But water is thousands of times more dense than air, so the bullet would travel much slower and be stopped much sooner. Of course, if you went very, very deep into the ocean, I suppose you might get to a depth where the pressure of the water is so great that it would be easier for the barrel to explode than it would be to expel the bullet into that great pressure (of course, by that pressure, the gun – not to mention you – would probably be crushed, so it’s a moot point anyway).>>
Wrong on several levels. Air is compressible, and thus relatively easy to drive out in front of the bullet. The amount of water held in the grooves of rifling is capable of wrecking many smaller bore rifles.
A firearm would not be damaged by high water pressure -except the cartridges loaded in it.
The water pressure is roughly even in all directs, so there would be no point where it was "easier" to burst the barrel due to it.