Nuclear powered USN Submarine Halibut
As built, SSN 587
USS Halibut (SSGN-587), a unique nuclear-powered guided missile submarine-turned-special operations platform, later redesignated as an attack submarine SSN-587, was the second ship of the United States Navy to be named after the halibut.
Regulus deterrence patrols, 1960 – 1965
Halibut began as a diesel-electric submarine, but was completed with nuclear power. She was the first submarine initially designed to launch guided missiles. Intended to carry the Regulus I and Regulus II nuclear cruise missiles, her main deck was high above the waterline to provide a dry "flight deck." Her missile system was completely automated, with hydraulic machinery controlled from a central control station.
Halibut firing a Regulus missile next to the aircraft carrier Lexington, 25 March 1960
Special operations missions, 1965 – 1976
Halibut with Diamond Head in the background in late 1965. Note her topside thruster and lack of DSRV
In February 1965 Halibut entered Pearl Harbor Naval Shipyard for a major overhaul, and on 15 August was redesignated as an attack submarine and given the hull classification symbol SSN-587. She sailed from Pearl Harbor on 6 September for the West Coast, arriving at Keyport, Washington, on 20 September. On 5 October she departed Keyport for Pearl Harbor and, after an eight-day stop over at Mare Island, California, arrived 21 October. Halibut then began ASW operations in the area, continuing until August 1968 when she transferred to Mare Island for overhaul and installation of: side thrusters; hangar section sea lock; anchoring winches with fore and aft mushroom anchors; saturation diving (mixed gas) habitat; long and short range side-look sonar; video and photographic equipment; mainframe computer; induction tapping and recording equipment; port and starboard, fore and aft seabed skids ("sneakers"); towed underwater search vehicle ("fish") and winch; and other specialized oceanographic equipment. She returned to Pearl Harbor in 1970 and operated with the Pacific Fleet and Submarine Development Group One (SubDevGruOne) out of Naval Submarine Support Facility San Diego (present day Naval Base Point Loma / Ballast Poinnt) with attachment offices at Mare Island until decommissioning in 1976.
View of Halibut departing San Francisco, likely in the mid 1970s.
Halibut was also used on secret underwater espionage missions by the United States against the Soviet Union.[5] Her most notable accomplishments include:
The underwater tapping of a Soviet communication line running from the Kamchatka peninsula west to the Soviet mainland in the Sea of Okhotsk (Operation Ivy Bells)
Surveying sunken Soviet submarine K-129 in August 1968, prior to the CIA's Project Azorian.
The latter mission is profiled in the 1996 book, Spy Sub – A Top Secret Mission to the Bottom of the Pacific, by Dr. Roger C. Dunham, although Dunham was required to change the name of Halibut to that of the non-existent USS Viperfish with a false hull number of SSN-655 in order to pass Department of Defense security restrictions for publication at the time.
http://www.navsource.org/archives/08/08587.htm
Operation Ivy Bells
https://www.youtube.com/watch?v=K4N-4ydW6Hk