Instead of focusing on survivors, being able to retrieve various items from the water or from drifting ships would be an excellent touch. Such as the following:
-Naval Codebooks
-Signalling Tables
-Convoy Organization Documents
-Cargo Manifests
-Intelligence Reports
On more than one occasion submarines managed to locate valuable information about the Allies' war effort either by boarding wrecks or searching the flotsam. At the end of the patrol you should get a renown boost for every such item you retrieve, as long as it has some intelligence worth. We already have the ability to rescue shot-down pilots, so I doubt it would be that tough to code.
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