HMS Ocean (L12)
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| Missing image Hmsocean.600pix.jpg The sixth HMS Ocean The sixth HMS Ocean
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| Career | 
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| Ordered: | 11 May 1993 |
| Laid down: | 30 May 1994 |
| Launched: | 11 October 1995 |
| Commissioned: | 30 September 1998 |
| Decommissioned: | |
| Fate: | Template:Active in service |
| Struck: | |
| General Characteristics | |
| Displacement: | 21,578 tons |
| Length: | 208 metres |
| Beam: | 34.4 metres |
| Draught: | 6.6 metres |
| Propulsion: | 2 Crossley Pielstick diesel engines |
| Speed: | 18 Knots max (15 knots cruise) |
| Range: | 8000 miles |
| Complement: | 284 officers and crew + 180 Fleet Air Arm + 800 Royal Marines |
| Armament: | Phalanx CIWS |
| Aircraft: | Assorted helicopters, typically Westland Commando and Lynx but also Merlins and Chinooks; capable of carrying (but not operating) VTOL types such as BAe Harriers, or Sea Harrier |
| Motto: | |
The sixth HMS Ocean (L12) of the Royal Navy is a Landing Platform, Helicopter Cruiser, the only one in its class, built by Kvaerner Govan on the Clyde taking advantage of commercial build methods and facilities, before sailing from Barrow-in-Furness for fitting out prior to acceptance into service with the Royal Navy. She is based on the Invincible class design, but due to the commercial standards used, the construction cost of £154 million is comparable to that of a Type 23 frigate.
She was launched on October 11, 1995, and christened by Her Majesty the Queen on February 20, 1998, at the yard of the prime contractor Vickers Shipbuilding Engineering Limited, prior to the delivery voyage to her base port of Devonport, Devon.
She was commissioned on September 30, 1998, and completed her trials programme and initial Basic Operational Sea Training in the spring of 1999. While Ocean was undertaking first-of-class trials, she was called to Honduras to give humanitarian assistance following a hurricane.
Ocean was designed to provide the amphibious assault capabilities last offered by Albion and Bulwark, carrying an Embarked Military Force (EMF) supported by 12 medium support helicopters, six attack helicopters, and four Mk5 landing craft. Her secondary roles included afloat training, limited anti-submarine warfare, and providing a base for anti-terrorist operations.
Prior to Ocean's availability, the Invincible-class aircraft carriers had been required to support the helicopter-assault mission. Ocean freed them to concentrate on the role for which they were designed. During 2002, the ship played a major role in suppressing rebel activity in Sierra Leone, acting as a base for Boeing CH-47 Chinooks of the RAF.
Ocean was part of a large Royal Navy taskforce deployed for Operation Telic, the UK contribution to the 2003 Iraq War. In the helicopter assault role she was accompanied by HMS Ark Royal.
During the summer of 2004, trials were conducted operating an Apache AH Mk 1 from Ocean, to enable the Army's new attack helicopter to eventually operate afloat.
HMS Ocean is the City of Sunderland's adopted ship.
See HMS Ocean for other Navy ships of the same name.