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10 of the world's most spectacular artificial reefs

USNS Hoyt S. Vandenberg

Photo: Matthew Hoelscher/flickr

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USNS Hoyt S. Vandenberg

The second largest artificial reef in the world built from a sunken ship is the USNS Hoyt S. Vandenberg, scuttled in 2009 off Key West, Fla. The site grants divers an unprecedented look at the remains of a World War II-era troop transport ship, as well as offering marine life a bastion on the sea floor.