Remembering USS Thresher (SSN 593)

Published April 10, 2026

Today is the 63rd anniversary of the loss of U.S. Navy submarine USS Thresher (SSN 593) at sea. Although Newport News Shipbuilding didn’t build Thresher, we honor the 129 officers, crew and civilians who lost their lives during the tragedy. It also is an important reminder that our quality work keeps Navy sailors safe.

On April 10, 1963, Thresher began deep dive tests off the New England coast during sea trials following an overhaul. The crew reported minor difficulties at 9:13 a.m. At about 9:15 a.m., communications with the submarine were lost. The sea trials escort ship heard sounds believed to be the pressure hull imploding at 9:18 a.m.

An investigation concluded that the loss of Thresher was most likely the result of a failed piping joint that led to the submarine’s implosion. As a result of the tragedy, the Submarine Safety program, known as SUBSAFE, was created to keep safety and quality at the forefront of shipbuilding.

Honor the legacy of Thresher and the sacrifice of the 129 people who lost their lives in this tragedy by dedicating yourself to the highest standards of excellence.

To observe the anniversary, shipbuilder and trumpet player Aaron Reeves (O29) will play “Taps,” which will be broadcast via NNS’ mass area communication system at 9:15 a.m. and 9:15 p.m. today.

Please take a moment to watch a video, which pays tribute to those lost and includes a message from Philip Ashe, NNS’ SUBSAFE program deputy director. The video is available on our NNS to Go app, MyNNS and HII’s YouTube channel.