Military submarines are out there, lurking under the water, ready for action, but how long can they stay down there? It's ...

during which water nearly evaporated in one unit but the fuel rods remained submerged through fortuitous leakage from a reactor well and other makeshift measures. The Nuclear Regulatory Commission ...

Equipped with Rolls-Royce PWR2 reactors, they can circumnavigate the globe submerged, recycling air and water for theoretically unlimited endurance. -Their quiet operation, enhanced by 39,000 anti ...