Source: National Geographic
A team of National Park Service (NPS) archaeologists and National Geographic photographers has completed a 10-day mission to uncover the secrets of the U.S.S. Arizona, a 608-foot-long battleship that was sunk in the Japanese attack on Pearl Harbor in 1941.
A remotely operated vehicle (ROV) known as the “11th Hour,” which was built by Marine Imaging Technologies and the Woods Hole Oceanographic Institute, took scientific measurements and documented the interior of the wreck for the first time. A Harvard University lab will be analyzing the gathered data over the coming months, including levels of dissolved oxygen, salinity, pH, and oil, sediment, and microbiological samples.
“Most of the water in Pearl Harbor is more than 80 percent dissolved oxygen, which would quickly corrode a ship,” says Brett Seymour, deputy chief and photographer of the NPS’s Submerged Resources Center (SRC). “But as we went lower and lower on the Arizona, the dissolved oxygen levels kept decreasing—drastically. By the time we reached some of the cabins on the third deck, it was just 4 percent.” This explains why the wreck is so well-preserved.
Read more about the mission here, and watch footage showing the impressive preservation inside the sunken vessel, below.
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