USS Dolphin (AGSS-555)

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USS Dolphin (AGSS-555)
USS Dolphin (AGSS-555)
Namesake: Dolphin
Ordered: 10 August 1960
Builder: Portsmouth Naval Shipyard
Laid down: 9 November 1962
Launched: 8 June 1968
Sponsored by: Mrs. Daniel Inouye
Commissioned: 17 August 1968
Decommissioned: 15 January 2007
Out of service: 22 September 2006
Struck: 15 January 2007
Status: Museum Ship at the Maritime Museum of San Diego
Badge: USS Dolphin AGSS-555 Badge.jpg
General characteristics
Class and type: Dolphin-class submarine
  • 805 long tons (818 t) light
  • 861 long tons (875 t) full load
  • 56 long tons (57 t) dead
Length: 46.3 m (151 ft 11 in)
Beam: 6 m (19 ft 8 in)
Draft: 4.8 m (15 ft 9 in)
Endurance: 15 days
Test depth: 3,000 ft (910 m) (unclassified)
Capacity: 12 tons on external mounting pads, six port, six starboard, forward and aft of sail[clarification needed]
Complement: 3 officers, 20 men, 4 scientists[1] (46 crew, all are not deployed.)
Armament: smallarms. No internal torpedo tubes. An external tube could be mounted to be used for experiments.
Notes: fitted with a 20-ton keel section to be jettisoned by explosive bolts for surfacing under emergency conditions[1]

USS Dolphin (AGSS-555) was the United States Navy's last operational diesel-electric deep-diving research and development submarine.[2] She was commissioned in 1968 and decommissioned in 2007.

Construction and service[edit]

Dolphin's keel laid on 9 November 1962 at the Portsmouth Navy Yard, Kittery, Maine. She was launched on 8 June 1968, sponsored by Mrs. Daniel K. Inouye, and commissioned on 17 August 1968 with Lieutenant Commander J.R. McDonnell in command. Despite a recent repair and upgrade, Dolphin was decommissioned on 15 January 2007 and stricken from the Naval Vessel Register on the same date. She is now a museum ship in San Diego Bay under the management of the San Diego Maritime Museum.


The single most significant technical achievement in the development of Dolphin is the pressure hull itself. It is a constant diameter cylinder, closed at its ends with hemispherical heads, and utilizes deep frames instead of bulkheads. The entire design of the pressure hull has been kept as simple as possible to facilitate its use in structural experiments and trials. Hull openings have been minimized for structural strength and minimum hull weight, in addition to eliminating possible sources for flooding casualties. The submarine has no snorkel mast; her one hatch must be open while her diesels are running.


Employed by both civilian and Navy activities, Dolphin is equipped with an extensive instrumentation suite that supports missions such as acoustic deep-water and littoral research, near-bottom and ocean surveys, weapons launches, sensor trials, and engineering evaluations.

Because she was designed as a test platform, Dolphin can be modified both internally and externally to allow installation of up to 12 tons of special research and test equipment. The submarine has internal and external mounting points, multiple electronic hull connectors, and up to ten equipment racks for project use.

Service record[edit]

In August 1969, Dolphin launched a torpedo from the deepest depth that one has ever been fired. Other examples of Dolphin's work include

  • first successful submarine-to-aircraft optical communications
  • development of a Laser Imaging system of photographic clarity
  • development of an Extreme Low Frequency (ELF) antenna for Ohio-class submarines
  • evaluation of various non-acoustic ASW techniques
  • evaluation of various low probability of interception active sonars
  • first submarine launch of a mobile submarine simulator (MOSS) system
  • first successful submarine test of BQS-15 sonar system
  • development of highly accurate (10 cm) towed body position monitoring system
  • development of a new Obstacle Avoidance Sonar system
  • development of a highly accurate target management system
  • evaluation of a possible "fifth force of nature"
  • first successful submarine-to-aircraft two-way laser communication
  • deepest submarine dive- more than 3,000 feet.[3]

Dolphin was overhauled in 1993.

In the late 1990s, Dolphin tested a new sonar system. As a result of Dolphin's efforts, this new system will now be retrofitted into the fleet.

Abandonment at sea incident[edit]

On 21 May 2002, at about 2330 PDT, while operating approximately 100 miles (160 km) off the coast of San Diego, California, Dolphin was cruising on the surface, recharging her batteries, when a torpedo shield door gasket failed, and the boat began to flood. Due to high winds and 10-to-11-foot (3.0 to 3.4 m) swells in the ocean, approximately 70 to 85 tons of seawater entered the ship, an amount perilously close to the boat's reserve buoyancy. The flooding shorted electrical panels and started fires.

Chief Machinist's Mate (SS) John D. Wise Jr. dove into the 57 °F (14 °C) water of the flooded pump room. With less than a foot of breathable space in the compartment, he ensured the seawater valves were lined up, allowing pumping out to commence. Once the valves were aligned, he remained in the pump room for more than 90 minutes in order to keep a submersible pump from becoming clogged. His courageous efforts prevented the loss of the ship and crew. Wise received the Navy and Marine Corps Medal for his efforts.

After 90 minutes, with fire and flooding beyond the ability of the crew to control, Commander Stephen Kelety, Dolphin's commanding officer, ordered the crew of 41 and two civilian Navy employees to abandon ship. The Oceanographic Research ship McGaw was operating in the vicinity and immediately responded to Kelety's call for assistance. They were evacuated by boat to McGaw after the hatches had been secured. All crewmembers were safely recovered with only a few minor injuries. Two were recovered from the water by United States Coast Guard helicopter during the transfer. McGaw transported the crew to San Diego. USS Thach (FFG-43) also came alongside Dolphin and rescued several crewman from the water but the seas were too rough for full recovery or towing operations.[citation needed]

The quick response of the crew placed the submarine in a stable condition. Submarine Support Vessel Kellie Chouest got underway from San Diego early on 22 May to assist in recovery. Dolphin was towed back to San Diego the following day.


Dolphin berthed next to Berkeley at the San Diego Maritime Museum

Dolphin underwent three and a half years of repairs and upgrades at a cost of $50 million, then completed sea-trials during the summer of 2005 and returned to her duties for one year.

In mid-2006, the Navy decided to retire Dolphin, citing the $18 million her operations cost annually. She was deactivated on 22 September 2006, and decommissioned and struck from the Naval Vessel Register on 15 January 2007. Her 38 year career was the longest in history for a US Navy submarine.

Dolphin was officially transferred to the San Diego Maritime Museum in September 2008, to become the eighth vessel in their floating collection. She was opened to the public for the first time on 4 July 2009.[4]

See also[edit]


  1. ^ a b c Lindsey, E.E., LCDR, USN "USS DOLPHIN (AGSS-555) – The Navy's New Deep Diver" in Naval Institute Proceedings Vol. 95 No. 9 September 1969 pp.138–141
  2. ^ Stillwell, Paul. "The Last Diesel Boat". Naval History magazine (February 2008). 
  3. ^ Burge, Michael (4 July 2009). "Sub Dolphin Surfaces As Museum Piece". San Diego Union-Tribune. p. B1. 
  4. ^ San Diego Maritime Museum

External links[edit]