Nuclear submarines can theoretically remain submerged underwater for up to twenty-five years without ever needing to refuel their reactors.

A closer look

Nuclear submarines can theoretically remain submerged underwater for up to twenty-five years without ever needing to refuel their reactors. The only actual limiting factor for their deployment is the amount of food they can carry for the crew, proving once again that human biology is the weakest link in any advanced engineering project. You have a multi-billion-dollar stealth machine capable of unleashing armageddon, and it has to surface simply because a bunch of sailors ran out of frozen pizza and powdered eggs. Living in a windowless steel tube that smells consistently of diesel and body odor while lurking silently beneath the ocean waves sounds like a great way to slowly lose your mind, but at least the government does not have to worry about the gas mileage