It depends of the angle but itīs very difficult for a 50 cal bullet penetrate a pressure hull below water.It means that damages in diesel engines and hull can be very limited.
Mythbusters Shooting 50 Caliber Sniper into Water
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But this ship can't sink!...
She is made of iron, sir. I assure you, she can. and she will. It is a mathematical certainty.
Strength and honor
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