Quote:
Originally Posted by _Seth_
IIRC, in a scene i "Das Boot" (at the beginning, the LI told the Kaleun that one of the screws had been replaced, something that made the Kaleun very happy, since they "got rid of that whining noise.." (Please correct me if this is wrong, mates). Considering this, i could only imagine what importance the sounds of the screws must have had. 
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Your quite correct mate. A screw/propellor blade with damage to one of it's blades could quite possibly create a cavitational noise.