10 April 1963 April 9, 2012 Author: Staff 129 sailors die when the submarine USS Thresher sinks at sea. Famous Words of Inspiration..."It is difficult to know at what moment love begins; it is less difficult to know that it has begun." Henry Wadsworth Longfellow — Click here for more from Henry Wadsworth Longfellow Related posts: 21 March 1963 8 April 2005 Categories: History Tags: 10 April, 1963