In combination with a full rework, recommended. Its an idea i've said for a long time.

There would have to be significant nerfs and buffs however; such as reload nerf, either removal or lowering of the amount of damage in crit dive, a delay to firing after coming out of crit dive, and a removal of the auto detonate after a certain amount of time (i.e. you only get the splash explosion if you hit. If you miss, they just dud).

Other problems that need to be fixed are the submergence, lack of ammo, national advantages, and inability to remove turrets. As well as a change in HH to be aimed at low damage but better reload, and a reworking of the ASW system (including removal/heavy nerf of PHH)

I don't recommend this because being able to maneuver in CD (completely undetected movement) is unfair.   A well DP'd SS5 could easily maneuver into position against an opposing sub and come out of CD with an advantage position.