What man could not achieve, nature apparently has for the largest intentionally sunk ship in the world. The Spiegel Grove is now in an upright position, courtesy of Hurricane Dennis. Itâs a position project organizers have dreamed of since the retired 510-foot Navy Landing Ship Dock prematurely sunk and rolled over on 17 May 2002, leaving the shipâs upside-down bow protruding above the water. Three weeks later, a salvage team managed to fully sink the vessel on its starboard side. For more than three years, the Spiegel Grove has been the most popular artificial wreck in the Florida Keys.