On Sun, 12 Apr 2009 21:44:45 -0400, "Cliff Hartle"
wrote:

Well no matter what everyone else has said, Mythbusters did this and guess
what.

Doesn't matter, they actually fired guns under water which is a more
stringent test and they worked.

http://kwc.org/mythbusters/2006/04/e..._reopened.html

Interestingly enough, this one says: "Tory made sure that there was no
air in the barrel because, if there was, the barrel could explode."

That seems to imply that if there is both air and water in the barrel,
the barrel can "explode". So there would still be a big problem coming
out of the water (with water leaking from either end of the barrel) to
shoot into the lifeboat.