Not necessarily so.
Being a nuclear attack submarine veteran, I can tell you the the limiting factor of how long a submarine can stay submerged is the crew (barring mechanical breakdowns.) With the nuclear powerplant, we didn't have to surface (or snorkel) unless we had to ventilate due to a fire or toxic gas emergency. Nuke subs have equipment to: produce oxygen; elimate carbon dioxide, carbon monoxide, and hydrogen; provide heating and air conditioning; make water (for engineering needs, cooking, drinking, bathing, and watering the battery cells); navigation; and so on.
When we went on long deployments (away from ANY port for up to three months), we spent a lot of time storing food in every nook and cranny. Sometimes, we'd place canned food on the deck and covered them with wood. So the already short headroom (and I'm 6'-4"!!) got shorter. We'd eat that stuff first to get our space back.
Don't think I'm slamming you,james. I just wanted you to know what it's like out there on a nuke sub.
I haven't seen this movie, but I heard about it recently and would like to check it out. It sounds like a very sobering viewing.
BTW, for a good look into what it's like being stationed on a submarine, check out "Das Boot." Sure it takes place on diesel-electric German U-boat, but the way the crew was portrayed was very realistic. Oh, although modern subs are bigger, they are still cramped just not THAT cramped (and we didn't have to run forward for emergency dives!!!) :)
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