Wreck of WWII 'Hit 'Em Harder' submarine, which sank with 79 crew on board, discovered in South China Sea

Shipwreck hunters have discovered the remains of a famous American submarine that sank with 79 crew on board while fighting a Japanese warship near the Philippines in 1944.

According to the New York-based Lost 52 Project, which made the discovery, the wreck of USS Harder now lies on its keel on the bottom of the South China Sea near the northern Philippine island of Luzon at a depth of around 3,750 feet (1,140 meters).

Naval reports of the sub's final mission say the Harder — a Gato-class sub named after a type of fish (the harder mullet) and nicknamed the "Hit 'Em Harder" — sank with all crew on Aug. 24, 1944 after it was heavily damaged by depth charges in a battle with a Japanese destroyer.

The Harder was one of the most famous American submarines of World War II. U.S. Navy records report that it torpedoed and sank five Japanese destroyers and several other enemy ships during six successful patrols in the Pacific war theater.

"This is one of the most celebrated WWII submarines and an historic naval discovery," Tim Taylor, the founder of the Lost 52 Project, told Live Science in an email.

Related: 30 incredible sunken wrecks from WWI and WWII

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War grave

Taylor is the CEO of a company called Tiburon Subsea, which uses autonomous underwater vehicles (AUVs) and other technologies to collect data at underwater sites. He also leads the Lost 52 Project, which aims to locate the wrecks of the 52 American submarines lost at sea during World War II and four lost during the Cold War.