Seaplanes & Submarines

[copeab]

Originally Posted by ak_aramis

If your goal with subs is avoiding weather, then it's pretty safe to assume a need for 50m depth, plus 5m above surface, as needed for snorkel, so a safety margin of ±5m for 60m snorkel, of which 10m is probably rigid.

Most ocean going subs of this era (as compared to coastal subs) had a safe diving depth of around 100m or yards, which should be sufficient. Even coastal subs could usually make 75m.