Type Ix Or 7??

[Tessa]

Another aspect of the IX's is that their dive rate is extremely slow. There's a good chance that you'll take damage just from trying to dive which is frustrating as hell. Conversely though when weather permits my AA PO's shoot down a lot of planes. Oddly enough though O2 seems to be the biggest problem for long submerged sessions, my boat will run out of air before the batteries die.