USS Trepang (SS 412) Battle Flag

American submarines played a crucial role in the Pacific theatre during World War II. Most U.S. submarines served in the Pacific, patrolling and hunting enemy ships. Between December 1941, when the United States entered World War II, and September 1945, when Japan...

Submarine Dolphins

Can you think of a symbol that has immediate meaning for you? Maybe it’s the American flag, the logo of your favorite sports team, or your college mascot. For the men and women of the Submarine Force, it’s the submarine warfare insignia, known informally as submarine...

Sediment from USS Scorpion’s Resting Site

This ocean floor sediment in the U.S. Naval Undersea Museum’s collection (left) comes from the final resting place of the fast attack submarine USS Scorpion (SSN 589). Scorpion is one of only two nuclear-powered submarines the U.S. Navy has lost. The cause of...

Submarine Rescue Chamber

The submarine rescue chamber (SRC) was developed in the early 1930s to rescue submariners from downed submarines. One was famously used in May 1939 to save 33 men trapped in sunken USS Squalus (SS 192). The Navy continues to own and operate rescue chambers today...

MK 7 Swimmer Delivery Vehicle (SDV)

The MK 7 Mod 6 swimmer delivery vehicle (SDV) was used by Navy Special Operations Forces (SOF) and Underwater Demolition Teams (UDTs) during the late 1960s and early 1970s, including during the Vietnam War. SDVs are small, free-flooding submersibles that allow the...