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About: NR-1 Sinkhole     Goto   Sponge   NotDistinct   Permalink

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The NR-1 Sinkhole is a giant underwater sinkhole located in the Straits of Florida 40 miles (64 km) southwest of Key West, Florida. It is found at an approximate depth of 1,886 feet (575 m) of water at the foot of the , an area of Quaternary sediment. It was discovered in October 1994 during a survey conducted by the American submarine NR-1, a U.S. Navy nuclear research submarine, and is named for the submarine. It was first identified via side-scan sonar and near-bottom echo sounder data, prompting a second survey in May 1995 to confirm the finding.