One possibility I've heard of:
Submerge and run on battery.
When the battery gives out, surface.
Even though you're out of fuel, the battery still recharges.
It's slow going, but I've heard of people making it back to port this way.
I remember reading about one boat that was heavily damaged. The crew tried to rig up a sail to get closer to land before scuttling the boat. Can't remember which one it was right now.
Edit:
USS Grenadier (SS-210)
After thirteen hours stuck on the bottom at 270 feet:
Quote:
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The electricians and engineers continued working to restore propulsion from the diesel engines, but both shafts were too badly damaged. At 0400 hours the next day, they informed Fitzgerald that the propulsion system was too far gone to be restored. Fitzgerald had his men begin working on a sail that might be able to move Grenadier closer to the beach, so the men could disembark and she could be blown up. But the sail was not effective in the still, tropical air.
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