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Sunken Coast Guard Cutter, Florida Keys, 1996

"In 1987 the retired Coast Guard cutter Duane was deliberately sunk in 120 feet [36.6 meters] of water seven miles [11.3 kilometers] off Key Largo. ... Corals and sponges ornament the hull, and the wheelhouse shelters schools of grunts."

—From "Blue Refuges: U.S. National Marine Sanctuaries," March 1998, National Geographic magazine

Photograph by David Doubilet