Michael J. Caboose

I was wondering if subs would or could be added to the game? Since one of the responsibilities of escorts was warding off subs, so it makes sense some displacement would be put to depth charges and hedgehog mortars. Subs would reinforce the need for destroyers/Torpedo Boats as escorts and only using cruisers and battlecruisers as heavier support. As for the controls I think it should be akin to the controls in Atlantic Fleet. Which is only 4 depths; surface, periscope depth, deep, and very deep. Attacking would be very similar to how it is now attack, retreat, etc. Do you think subs should be added? Why or why not? Any ideas on how they should be implemented?