Been in a few prime time sessions so far with these subs. Nearly all of my thoughts have been expressed already in posts by other players. I find myself rarely using the max depth ability as in y opinion there is no clear mechanic to use it for except to reduce depth charge damage. What I would recommend is putting a 20-30 timer on it and making it to where torps can not be fired you loose sight of al ships effectively like silent running that subs use as a means of escape. Because as it is there is not an effective way for subs to escape the ASW area. The other item I want to mention is the depth charge planes for BBs, while a sub is submerged there as not a good way to adequately lead the target from such a horizontal view maybe making the view a little more vertical when launching might help alleviate that.