They kept hatch closed when it was really stormy. That's a fact Heinz Schaeffer tells in his book U977. (He was the CO of the boat)
Once, H.S. was a younger officer at that time, they ended down to 32 meters or so. It took quite a time before the boat was on the surface next time. S tells how the hatch opend and someone from the conn looked if they (watch crew) were still on the bridge and alive.
-RC-
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