Keywords: Battleship Arkansas aircastle.jpg Arkansas lying upside down at a depth of 180 feet in Bikini Lagoon Photo from a 1989 National Park Service dive Delgado James P et al The Archeology of the Atomic Bomb National Park Service Santa Fe New Mexico 1991 p 97 National Park Service Larry Murphy 1989 PD-USGov Casemates naval artillery Category USS Arkansas BB-33 Underwater shipwrecks |