In 1989, the Soviet nuclear-powered attack submarine Komsomolets sank to the bottom of the Norwegian Sea, along with its nuclear reactor and two nuclear warheads onboard. Komsomolets was constructed with a titanium alloy exterior that allowed it to reach far greater depths than any other submarine a t the time. Now, it has stayed at these depths for over 30 years, slowly leaking radioactive materials and creating ongoing concerns about radioactive contamination. ...read more read less