I played 6 patrols than i surrended to a english DD
....They made me surface the boat because i was out of oxigen!! WOW,very realisitic !! When i surfaced they sunk me in 30 seconds .... shootin at me with all they have... a sailor trowed a deep charge inside my connin tower than closed the hatch
.
Anyway....im actually on my 2nd career at 6th patrol and still alive.