USS Pigeon (ASR-21) (Non-retention)

The USS Pigeon was the lead ship of its class of submarine rescue ships.  The ship was laid down on July 17, 1968 by the Alabama Dry Dock and Shipbuilding Co., Mobile, Alabama.  It was launched on August 13, 1969, and commissioned on April 28, 1973. This new class of submarine rescue ships was designed to operate with the Navy's new deep submergence rescue vehicles. The twin hull provided excellent stability for deep water operations and provided generous space for working on deck.   The ship could carry two deep submergence vehicles on its main deck and when necessary, could dock to a disabled submarine on the sea bottom, remove survivors, and transport them to the surface. Pigeon also carried the McCann diving bell, or rescue chamber, which was used to rescue the survivors of the submarine Squalus (SS-192) in 1939. Pigeon was decommissioned on August 31, 1992 and entered the Maritime Administration’s Suisun Bay Reserve Fleet in September of 1992. 

Naval History and Heritage Command Dictionary of American Naval Fighting Ships