Episode 230: The sinking of the USS Thresher

On April 9th, 1963, the nuclear-powered submarine USS Thresher departed Portsmouth Naval Shipyard for depth tests in the Atlantic. It would never return. Videos: Second Saturday: The Loss of the USS Thresher Finding the Titanic | Bob Ballard: An Explorer's Life Articles and books: U.S. Naval Institute: What Killed the Thresher? Arlington National Cemetery: USS Thresher memorial Titanic Discovery was By-Product of Military Quest The Death of the USS Thresher: The Story Behind History's Deadliest Submarine Disaster, by Norman Polmar Navy documents reveal officer flagged "dangerous condition" before deadliest submarine disaster in U.S. history