USNS General Hoyt S. Vandenberg (T-AGM-10)

The USNS General Hoyt S. Vandenberg is the second-largest artificial reef ship in the world — a 523-foot former United States Air Force missile-tracking vessel deliberately sunk in 2009 in the waters off Key West, Florida, creating an underwater structure of staggering proportions that has rapidly become one of the most celebrated advanced wreck dives in North America. The Vandenberg served for decades as a missile range instrumentation ship, tracking ballistic missile tests and shuttle launches with its massive antenna arrays — two of which still stand on the ship's deck, rising dramatically from the seafloor as the most visually distinctive features of the wreck. The vessel rests upright at a maximum depth of approximately 44 meters (about 144 feet), with the top of the radar dome structure beginning at around 17 meters from the surface — providing a range of depths accessible to both advanced recreational divers (who can visit the upper superstructure) and technical divers (who can explore the lower hull sections and below-deck spaces). In just over fifteen years since sinking, the Vandenberg has been dramatically colonized by marine life: the hull surfaces are thick with encrusting corals, sponges, and gorgonians, and the water column above the wreck is consistently packed with large schooling fish. Goliath grouper — some among the largest individuals encountered in the Florida Keys — have established the Vandenberg as prime territory, sometimes hovering directly at the camera dome structures with the casual authority of animals that know they have nothing to fear. Barracuda, large amberjack, and schools of Atlantic spadefish fill the mid-water. The sheer scale of the Vandenberg is impossible to fully appreciate from any single dive position, and multiple dives are needed to understand the enormity of what lies beneath the Key West seabed. This is a bucket-list dive for advanced divers across the country.