Actually the problem would not have been lack of O2, but rather CO2 build up. I visited the cemetery a few years back myself. Left my dolphins on Lt. Dixon’s grave.
THAT is a great gesture, FRiend.
And thanks for serving.
Funny, my wife asked me out of the blue the other day (I don't know why) if I would have wanted to serve on a submarine, and without any hesitation I said "Oh, God no!" but then quickly added "I could do it, but never had even the slightest inclination or desire. I think those people who do it really start out with that, and that's important."
I have always had a great deal of respect for men who serve in the submarine force.