America's national security relies in part on the U.S. Navy's nuclear-powered submarines, which can operate more than 800 ...

TOKYO -- The world's deepest-diving submarine has disappeared in the choppy Pacific Ocean off Japan, a setback to deep-sea research on everything from earthquakes to rare bacteria. Kaiko, a bright ...

Submarines are pretty cool bits of kit. They can offer researchers an unrivaled view of the ocean floor, help search out missing wrecks beneath the waves and can even ferry about the rich and famous, ...

In the mid-1980s, the Soviet Union constructed a super submarine unlike any other. Fast and capable of astounding depths for a combat submersible, the submarine Komsomolets was introduced in 1984, ...