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Craighead Caverns is an extensive cave system located in between Sweetwater and Madisonville, Tennessee. It is best known for containing the United States' largest and the world's second largest non-subglacial underground lake, The Lost Sea. In addition to the lake, the caverns contain an abundance of crystal clusters called anthodites, stalactites, stalagmites, and a waterfall.
Dean's Blue Hole in the Bahamas was previously thought to be the world's deepest underwater sinkhole, at a depth of more than 660 feet. The Sansha city government in Hainan Province, China, said it has drafted measures to protect and study the blue hole in the South China Sea.