by 
Mawgan
ANSWERS: 4
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My understanding is that the limit to submersion time is usually because the humans on board run out of supplies. A nuclear powered submarine (say remote controlled/uninhabited) could stay submerged indefinitely or at least until it ran out of fuel. From what I could find with a quick search online, the Russian typhoon (nuclear) can stay submerged for 6+ months and diesel-electric subs can last 2-3 weeks.
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I've seen one that never needs to resurface, so you could say indefinitely. It was sunk off of NJ. A U boat.
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A modern, nuclear powered submarine is ONLY limited by the amount of food which can be brought aboard. . It is entirely possible, and routine, for ballistic missile submarines to make their entire three month (and sometimes longer) deployment underwater. Fast attack submarines can as well. . For longer periods, additional food stores can be brought aboard. And the Ohio class SSBNs and SSGNs can effectively double their food stores, if required, which would extend their underwater capabilities to six months. . The ship provides all other needs: oxygen and potable water from the ocean water, electric power from the nuclear reactor.
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A submarine can sink therefore can stay underwater for however long there is water in that area You're welcome :)
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