Quote:
Out'a fuel 200 km out from base (note to self: 20 lashes for the navigator
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Unfortunately, diesel engines in the u-boat are used to recharge the batteries. The batteries are used underwater because they don't have the problem of needing outside air to work.
Realistically, if you were stuck out at sea with no fuel, your best propulsion would be the charge left in the batteries or the men with rowing instruments, but the game doesn't feature them.