Submarines appeared on the global stage during World War I, when Germany unleashed a campaign of unrestricted submarine warfare in 1917 to sever supply lines between Great Britain and its allies. In ...

The Incident: How a Nuclear Sub Was Destroyed USS Thresher (SSN 593) was participating in deep-diving tests on April 9, 1963, off the coast of Massachusetts when she made her final communication.

The Thresher incident remains one of the most tragic days in the Navy’s history as 129 sailors and crew perished.