On April 10th 1963,
THRESHER was lost in the Gulf of Maine during a post-overhaul test dive along
with the 129 gallant crew, officers, Shipyard employees, and civilian contractors. This tragic loss led directly to significant changes in the
Navy’s submarine safety programs that have kept the nation’s submariners safe
ever since. The men of THRESHER are true Cold War American heroes whose sacrifice
we honor.