@Hartmann: the set depth value doesn´t really effect shallow water, because you can crash dive and when diving order periscope depth (or whatever depth) and so you have the fast diving time while avoiding hitting the ground.
In real life crash dive depth depended on the situation. When surprised by a destroyer they went very deep at once, when surprised by
a plane they usually went to 40 or 60m.
The problem I mentioned is that only crash diving gives you fast diving. If you set your crash dive to 30m but there´s a destroyer coming your way, you won´t have any chance to get deeper in the short time remaining.
Just try it out.
Cheers, AS
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