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In this photo provided by the Ocean Exploration Trust, the chrysanthemum flower crest, an honored imperial symbol of Japan, can still be seen prominently on the bow of aircraft carrier Akagi 81 years after the aircraft carrier's sinking on Sept. 10.OCEAN EXPLORATION TRUST/NOAA VIA AP
This photo provided by the Ocean Exploration Trust shows one of the large casemate guns on the lower deck of Japanese aircraft carrier Kaga on Sept. 10.OCEAN EXPLORATION TRUST/NOAA VIA AP
In this photo provided by the Ocean Exploration Trust, is the broken stern of the Japanese aircraft carrier Kaga with a view inside from the starboard quarter on Sept. 10.OCEAN EXPLORATION TRUST/NOAA VIA AP
In this photo provided by the Ocean Exploration Trust, the starboard list of the aircraft carrier USS Yorktown on the seafloor can be seen in the flight deck, also collapsing towards the starboard side at the bow with an anti-aircraft gun tub below on Sept. 10.OCEAN EXPLORATION TRUST/NOAA VIA AP
In this photo provided by the Ocean Exploration Trust, standing tall above the leaning flight deck, the shipʻs island is the most prominent feature on the USS Yorktown aircraft carrier on Sept. 10.OCEAN EXPLORATION TRUST/NOAA VIA AP
In this photo provided by the Ocean Exploration Trust, the aircraft crane of the carrier USS Yorktown still stands at the aft end of the ship's island on Sept. 10.U.S. NAVY VIA AP
Smoke billows from the USS Yorktown and bursts from anti-aircraft fire fill the air after a Japanese bomber hit the aircraft carrier in the Battle of Midway near Midway Islands during World War II in June 1942. Footage from remote submersibles taken three miles under the Pacific Ocean is giving the world the first detailed glimpse of three World War II aircraft carriers that sunk in the pivotal Battle of Midway, which marked a shift in control of the Pacific naval theater from Japanese to U.S. forces.U.S. NAVY VIA AP
In this photo provided by the U.S. Navy, the USS Yorktown lists heavily to port after being struck by Japanese bombers and torpedo planes in the Battle of Midway on June 4, 1942.NAVAL HISTORY AND HERITAGE COMMAND VIA AP
In this photo provided by the Naval History and Heritage Command is the Japanese aircraft carrier Akagi at sea in the summer of 1941.NAVAL HISTORY AND HERITAGE COMMAND VIA AP
In this photo provided by the Naval History and Heritage Command is the Japanese aircraft carrier Kaga at sea in the 1930s.