USNS General Hoyt S. Vandenberg- Key West, Florida

Scuttled six miles off Key West in 2009, this 520-foot-long retired Air Force missile-tracking ship sits at a depth of 140 feet, but even snorkelers can swim close to the antennae and upturned radar dishes. Large holes allow trained penetration divers to explore the engine room, 11 elevator shafts and cargo hold shafts.Local Dive Guide: Warm Water, Beginner Dives, Big Animals, Guide Needed, Year-Round