One of the United States’ most advanced nuclear submarines returned to port in Washington state this week flying a Jolly Roger, a move steeped in maritime lore and mystery.

The images of the USS Jimmy Carter, a Seawolf-class nuclear-powered submarine passing through the Hood Canal, were posted to a Pentagon media site and Twitter page. They show the skull and bones flying beside the American flag, the Washington Post reported.

The 450-foot-long Carter is one of three in its class and designed to conduct covert sea operations, the paper reported. The sub also was filmed returning from its last patrol in April with the Jolly Roger flying from the conning tower. – READ MORE