Hallo! A few months ago, this film passed on tv here and I saw it. My initial idea was that the film was going to be bad one but after all with is a pretty good submarines movie.
About the ship, since was a american sub, I think that was a Sargo class.
I think many of the DC were detonated by pressure based, but don't know if latter in the war were by the system that you sayed. And the hydrogen was also a surprise, because i dindn't know that the bateries lick hydrogen gas and that, as the movie show,can be a little hazardous the ones healt...
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