Hi h.sie,
I guess there is no historical data. Commanders just dived until the boat stopped rolling and pitching too much. Given the wind speeds in SH3 and the corresponding wave heights, I would guess that 20m should be fine. Since diving 10-20m deeper does not matter much, I think one single depth for all wind speeds would be fine. The two depths depending on wind speed seems to me more complex than necessary.
Cheers, LGN1
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