in stock you can go to 190 meteres without taking damage, although this can be increased by your officer's abilities. I have been able to ease down in short dips to 200-210 meters with minimal damage.
MO uses DDGRN's mod, "historical u-boat" I think which changes the crush depth. I don't use it so can't comment.
In RL, a dive by a VIIc to 200-220 meters was considered a very deep dive. In WW2, there was only one recorded dive (U-331 in nov.41) where a VIIc went to 250 meters and survived to fight another day.
I use the stock settings since I am comfortable with the stock crush depth.
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