[Calvin Locke]

The Soviets ended up losing a sub that had a fire. The fire compromised the auxiliary air system, so when the fire crew plugged their respirators into it, they dropped dead.

Most of the crew got off on the surface, before it sank. I think only one of the officers in the escape pod managed to escape before it too, sank.

[SunkenCiv]

There will probably be false positives, due to the number of ferrous vessels that must be on the bottom by now, including some U-boats..