The USS Spiegel Grove was a Thomaston-class dock landing ship that served the US Navy. It was decommissioned in 1989 and in 2002, the ship sank prematurely off Key Largo during a planned sinking. She sank several hours ahead of schedule and ended upside-down on the seafloor, with her bow protruding slightly out of the ocean. She was rolled onto her starboard side in the same year.
In June 2002, the USS Spiegel Grove was opened to divers and soon became hugely popular. During the first two years, about 100,000 dives were done on the ship. In 2005, Hurricane Dennis shifted the wreck onto her keel, right-side-up.
The wreck is considered an advanced dive, with a depth of 13-44 meters/45-144 feet. Penetration is possible, but only for experienced, certified wreck divers.
Due to the massive size of the wreck, which has a total length of about 155 meters/510 feet, up to four dives are necessary to see the entire ship. Divers are recommended to use Nitrox for this dive.