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 ...

What started as a simple RC dive turned into a surreal journey through history. Deep below the ocean's surface, a forgotten aircraft carrier looms—its ghostly halls frozen in time. Every frame of ...

We open today's column with this snippet from the Beatles for the simple reason that that's what the media is now calling the U.S. Navy's newest military asset -- the "yellow submarine." Navy's new ...