Comment by echoangle
3 months ago
https://en.wikipedia.org/wiki/HMS_Warspite_(S103)
Seems like the record is 111 days submerged.
Nuclear Subs are typically pretty big so they can probably bring enough food to last for the entire time without resupply.
Yeah that's the official record and it's pretty close to that on average. The main limit is morale.
People want their swim calls and sunlight.