Well, it depends on the weather I guess...
Your diesels a r e destroyed! You'll need help from BdU/nearest U-Boot. It will take a few days to arrive.
If you'll manage to survive for another 10 days you may be rescued. Surface and dive without engines 10 times and stay surfaced for 3 hours each turn to simulate the RAF and Navy efforts to find you.
If you survive - teleport back home and buy a new boat.
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