WATCH: New footage reveals remarkable preservation inside sunken battleship.

At Pearl Harbor, history is begetting history—again.

Earlier this week, Japanese Prime Minister Shinzo Abe joined President Obama at the World War II Valor in the Pacific National Monument—the latest step in a decades-long shift from postwar acrimony to forgiveness.

At the same time, 40 feet beneath the waves, the U.S.S. Arizona is giving up some of its 75-year-old secrets.

Sunk on December 7, 1941 by Japanese warplanes—during a surprise attack that plunged the United States into World War II and altered world history—the 608-foot-long battleship is one of the most studied shipwrecks in the world. In the 1980s, it was initially mapped; in the early 2000s, its condition and lifespan were analyzed. Yet exploration of the ship’s interior has long been

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