[TorpX]

I paged through some of the USN manual provided by SS. Interesting stuff. I noted that it was possible for at least some types of torpedos to be launched down to 200 ft. keel depth. They had to increase the impulse tank pressure to accomplish this. (Check pp 131-132.)

I think one of the reasons both the KM and USN favored impulse luanching of torpedos is that you would have to have the torpedo smaller in diameter, than the tube, or else it would not be able to swim out. The USN did this with the "cutie", but AFAIK, it was the only one.

So you not only can't open the doors if you're too deep, you can't close them again either!

I'm guessing that the game closes the tubes automaticly at a certain depth. I think this happens in SH 4.