Deepwater Horizon

Deepwater Horizon semi-submersible drilling rig.
History
Name:	Deepwater Horizon
Owner:	Transocean's Triton Asset Leasing GmbH
Operator:	Transocean
Port of registry:	Panama (23 February 2001 – 28 December 2004)  Marshall Islands, Majuro (29 December 2004 – 20 April 2010)
Route:	Gulf of Mexico
Ordered:	December 1998
Builder:	Hyundai Heavy Industries
Cost:	US$560 million
Way number:	89
Laid down:	21 March 2000
Completed:	2001
Acquired:	23 February 2001
Maiden voyage:	Ulsan, South Korea – Freeport, Texas
Out of service:	20 April 2010
Identification:	ABS class no.: 0139290 Call sign: V7HC9 IMO number: 8764597 MMSI no.: 538002213
Fate:	Sank on 22 April 2010 after an explosion and fire
Notes:	Located in the Gulf of Mexico at a depth of 5,000 ft (1,500 m) at 28°44′12″N 88°23′13″W / 28.736667°N 88.386944°W / 28.736667; -88.386944Coordinates: 28°44′12″N 88°23′13″W / 28.736667°N 88.386944°W / 28.736667; -88.386944
General characteristics
Class and type:	ABS +A1 DPS-3 Column Stabilized MODU
Tonnage:	32,588 GT 9,776 NT
Displacement:	52,587 t (51,756 long tons; 57,967 short tons)
Length:	112 m (367 ft)
Beam:	78 m (256 ft)
Height:	97.4 m (320 ft)
Draught:	23 m (75 ft)
Depth:	41.5 m (136 ft)
Deck clearance:	34.010 m (111.58 ft)
Installed power:	7,000 kW 11,000 volts 6 × Wärtsilä 18V32 9775 hp diesel engines 6 × ABB AMG 0900xU10 AC generators
Propulsion:	8 × Kamewa 7,375 hp, 360° fixed propeller azimuth thrusters
Speed:	4 knots (7.4 km/h; 4.6 mph)
Capacity:	Liquid mud: 705 m3 (24,900 cu ft) Drill water: 2,078 m3 (73,400 cu ft) Potable water: 1,185 m3 (41,800 cu ft) Fuel oil: 4,426 m3 (156,300 cu ft) Bulk mud: 386 m3 (13,600 cu ft) Bulk cement: 231 m3 (8,200 cu ft)
Crew:	146
Notes:

Deepwater Horizon was an ultra-deepwater, dynamically positioned, semi-submersible offshore drilling rig owned by Transocean. Built in 2001 in South Korea by Hyundai Heavy Industries, the rig was commissioned by R&B Falcon (a later asset of Transocean), registered in Majuro, and leased to BP from 2001 until September 2013. In September 2009, the rig drilled the deepest oil well in history at a vertical depth of 35,050 ft (10,683 m) and measured depth of 35,055 ft (10,685 m) in the Tiber Oil Field at Keathley Canyon block 102, approximately 250 miles (400 km) southeast of Houston, in 4,132 feet (1,259 m) of water.

On 20 April 2010, while drilling at the Macondo Prospect, an uncontrollable blowout caused an explosion on the rig that killed 11 crewmen and ignited a fireball visible from 40 miles (64 km) away. The fire was inextinguishable and, two days later, on 22 April, the Horizon sank, leaving the well gushing at the seabed and causing the largest oil spill in U.S. waters.

Deepwater Horizon was a fifth-generation, RBS-8D design (i.e. model type), deepwater, dynamically positioned, column-stabilized, semi-submersible mobile offshore drilling unit, designed to drill subsea wells for oil exploration and production using an 18.75 in (476 mm), 15,000 psi (100,000 kPa) blowout preventer, and a 21 in (530 mm) outside diameter marine riser.