I don't think you will use less fuel or battery power but your men won't tire out as fast in that compartment. In the torpedo rooms it does affect reload times. Repair times are also affected. The watch crew, the more green bar you have the more effricient they are at spotting planes and ships. As far as the radio/hydrophones, I only have one of those manned at a time, hydrophone wise, an experienced man does make a difference but you're still better off checking yourself once in a while, the radio, I have no clue.
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