Actually, we know what happened to the 356-foot-long, 2,500-ton Japanese submarine. It sank during a surprise attack by an Avenger bomber launched from the aircraft carrier USS Bogue, June 23, 1944. Faced with naval and air blockades that threatened to stifle Germany in WW II, Japan launched its secret C-3 type cargo submarine for transporting wartime raw materials to a naval base in Nazi occupied Lorient, France. Oh, and the gold? We’ll get to that in a moment.

How would you like to suit up on shore, walk out 20 feet on a marina dock, jump into 12 feet of water, and explore the remains of the Jefferson, a 20-gun brig built during the War of 1812? That’s what Kevin Crisman and Art Cohn did on three different occasions spanning six weeks of archaeological excavation.

In 1506, when Portugal navigator Tristan da Cunha discovered a remote island in the South Atlantic Ocean, he gave his name to it and planned to return and go ashore at a later date. He kept a log where he recounted a desire to explore “his” isle and three others: Nightingale, Gough and Inaccessible (named for difficulty in going ashore) islands that later became Tristan Archipelago.

In 1506, a Portuguese navigator sailed his ship around a small island in the South Atlantic Ocean. The waters were rough and he couldn’t go ashore, so he did the next best thing. He named the island after himself. Today, Tristan da Cunha, a small dot on the map between Africa and South America, is recognized as the most remote, inhabited island in the world.

Trivia question: Which island, located in the South Atlantic Ocean, hasn’t had a case of cancer for more than 200 years? Is listed in the Guinness Book of World Records as the “most remote inhabited island in the world?” Has 288 residents? Is named after the Portuguese navigator who discovered it? Is rumored to have buried treasure and many shipwrecks?