USS Thresher Remembered 50 Years After Sinking

It’s been almost 50 years since USS Thresher (SSN 593) sank off the coast of Cape Cod, Mass., claiming the lives of 129 Sailors and civilian technicians aboard.

Starboard bow view, July 24, 1961. (Official U.S. Navy Photograph, from the collections of Naval History and Heritage Command)

Starboard bow view, July 24, 1961. (Official U.S. Navy Photograph, from the collections of Naval History and Heritage Command)

Family members and dignitaries will remember the loss that led to a renowned submarine safety program during a ceremony this Saturday at 1 p.m. EDT in Portmouth, Maine.

Thresher, which was built at Portsmouth Naval Shipyard, Kittery, Maine, was the lead ship of a class of 3700-ton nuclear-powered attack submarines.

On April 10, 1963, Thresher began post-overhaul trials following lengthy testing and throughout evaluation of her many new technological features and weapons after her commissioning in August 1961.

Thresher transited with the submarine rescue ship Skylark (ASR 20) to an area approximately 220 miles east of Cape Cod and started deep-diving tests. Fifteen minutes after reaching her assigned test depth, Thresher informed Skylark of difficulties. Garbled transmissions indicated things were going wrong. Suddenly, listeners in Skylark heard a noise “like air rushing into an air tank” and then silence.

Navy ships circle in the vicinity of the site of Thresher's sinking, April 15, 1963, five days after her loss. (Official U.S. Navy photograph from the collections of Naval History and Heritage Command)

Navy ships circle in the vicinity of the site of Thresher’s sinking, April 15, 1963, five days after her loss. (Official U.S. Navy photograph from the collections of Naval History and Heritage Command)

 

Efforts to reestablish contact with Thresher failed. A search group was formed to locate the submarine. Rescue ship Recovery (ARS 43) retrieved bits of debris, including gloves and bits of internal insulation. Photographs taken by bathyscaph Trieste proved the submarine had broken up, claiming all hands on board.

 Thresher was officially declared lost April 12, 1963.

NEWS RELEASE PLEASE NOTE DATE DEPARTMENT OF DEFENSE, OFFICE OF PUBLIC AFFAIRS, Washington 25, D.C. No.515-63 IMMEDIATE RELEASE April 12, 1963 OXford 76161  Secretary of the Navy, Fred Korth, after a flying trip to confer with Submarine Force Officers in New London, and with Admiral Ramage at the scene of the Thresher search, returned to Washington tonight and issued an official declaration that the Thresher and all on board are lost.  At the same time, Secretary Korth ordered that all naval installations display the national ensign at half mast from tomorrow morning until sunset on Monday, April 15.  In making his official declaration of the loss, Secretary Korth expressed a fervent hope that the rumors and speculation which have already begun will cease, providing the bereaved families a more stable climate in which to compose themselves and endure their grief.  “In this connection,” he said, “I have the unequivocal assurance of all those in a position to know, including the Chief of the Bureau of Ships, the Commander, Submarines Atlantic and the Search and Rescue Commander on the scene that, in waters of this depth, there is absolutely no possibility that there might be survivors.” -END-

Department of Defense news release from April 12, 1963

 

A Court of Inquiry was convened and determined the loss was in all probability due to a casting, piping or welding failure that flooded the engine room with water. This water probably caused electrical failures that automatically shut down the nuclear reactor, causing an initial power loss and the eventual loss of the boat.

Almost two months after Thresher’s loss, the Navy’s Submarine Safety Program, also known as SUBSAFE, was created. The program established:

  • Submarine design requirements
  • Initial SUBSAFE certification requirements with a supporting process
  • Certification continuity requirements with a supporting process

Over the next several years, a massive program was undertaken to correct design and construction problems on the Navy’s existing nuclear submarines, and on those under construction and in planning.

The SUBSAFE program has been very successful. Between 1915 and 1963, 16 submarines were lost due to non-combat causes, an average of one every three years. Since the program’s implementation in 1963, no SUBSAFE-certified submarines have been lost.

At a ceremony commemorating the 25th anniversary of Thresher’s loss, the Navy’s ranking submarine officer in 1988, Admiral Bruce Demars, said,

“The loss of Thesher initiated fundamental changes in the way we do business, changes in design, construction, inspections, safety checks, tests and more. We have not forgotten the lesson learned. It’s a much safer submarine force today.”

You can watch the ceremony commemorating the 50th anniversary of Thresher’s loss on Saturday at 1 p.m. EDT here.

Source: Navy History and Heritage Command