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Originally Posted by Hitman
I'm no expert here, but I think a stopped (blocked) propeller would make noise if the sub is still moving or a water current flowing through the blades.
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Ding ding ding ding.. give this man a cigar!
The water flowing over the stopped surface fo the blade makes one heck of a cavitation noise. Move the flat of your hand through water rapidly and you will get the idea.