A bit OT but I read a little story about a finnish sub that ran aground while evading russian patrol boats because they had too much ballast. When they released some of the ballast, the surfacing gases and oil made the hunters to believe that the sub had sunk.
Shortly after, the sub ran aground again into an underwater elevation in the bottom and damaged its diving planes. By that time the crew was falling unconscious and became delirious because of the co2 rising too high, like the cook falling with a coffee mug in his hand and when the chief of the watch was told to start the pumps to get the boat on surface, the chief instead started to explain the operating principles of the pump.
Must have been a miracle to get the sub up again but they made it. And got hunted again
