THE TRAGIC LOSS OF THE NUCLEAR SUBMARINE THRESHER 10 APRIL 1963 BY CAPT ZACK T. PATE, USN, RET. RADM DAVID GOEBEL, USN, RET. and VADM GEORGE EMERY, USN, RET. Released: June 2018 The USS Thresher SSN-593 Underway 1961 (Lost 55 years ago - 10 April 1963) The USS Thresher (SSN-593) was the first in a new class of deep diving fast attack nuclear submarines. She was constructed in the Portsmouth Naval Shipyard in Kittery, Maine. By early April 1963 Thresher had completed her “Po