I messed with this a little and decided that the easy fix was to make the engines in the fleet boats impossible to destroy short of sinking the sub.
This is entirely realistic. To be dead in the water from engine damage, a US sub would have to have 5 diesels totally inoperable. This is simply not plausible (except HOR boats, lol, and they'd have the problem with no damage at all, lol).
Easy fix, make diesels impossible to destroy.
tater
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