Death of the USS Thresher

On the morning of April 10, 1963, the world''s most advanced submarine was on a test dive off the New England coast when she sent a message to a support ship a thousand feet above her on the surface: experiencing minor problem . . . have positive angle . . . attempting to blow . . . Then came the sounds of air under pressure and a garbled message: . . . test depth . . . Last came the eerie sounds...