that would definitely be a prop guard.
it would keep the screws from swinging into the wharf.
also, to keep from sucking in nets and mine cables.
I've seen similar guards on battleships and destroyers.
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Cold Waters Voice Crew - Fire Control Officer
Cmdr O. Myers - C/O USS Nautilus (SS-168)
114,000 tons sunk - 4 Spec Ops completed
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