TMO S Class Dive times?

[rein1705]

Hey guys. Im assigned to (was assigned to) the S-44 in Aug 1942 doing lifeguard duty in the Solomins. My radar picks up aircraft at roughly 20,000 yards the moment it does and i am informed of this theres 3 things i can do Dive, Dive to PD, or Crash dive... now most wouldnt think Crash dive but if i order any other option it takes my boat roughly 3 minutes to to reach 35-40 FT! though, there not a veteran crew and its in TMO 2.1
so what it comes to is im almost spotted or i actualy "SPOT" the aircraft before my boat is under and i get strafed and bomed a lot more than i think i should be. Prehaps i am wrong? is that normal for anyone else? and what was the real life avrage time to dive an S class sub? S-18/S-41 I thought the S-boats were hard enough to keep aflote in the first place diveing shouldnt be much of an issue unless its caused by how fragile they are wouldnt want to take her down too fast i understand... if i order crash dive she goes down in under a minute.