Deepwater Horizon

	Deepwater Horizon semi-submersible drilling rig.
History
Name	Deepwater Horizon
Owner	Transocean's Triton Asset Leasing
Operator	Transocean
Port of registry	Panama (23 February 2001 – 28 December 2004); Majuro (29 December 2004);
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 28.736667°N 88.386944°W
General characteristics
Class and type	ABS +A1 DPS-3 Column Stabilized MODU
Displacement	52.587 Mg
Length	112 m
Beam	78 m
Height	97.5 m
Draught	23 m (75 ft)
Depth	41.5 m (136 ft)
Deck clearance	34.010 m (111.58 ft)
Installed power	7 MW 11 kV; 6 × Wärtsilä 18V32 7.2 MW diesel engines; 6 × ABB AMG 0900xU10 AC generators;
Propulsion	8 × Kamewa 5.5 MW, 6.3 rad fixed-propeller azimuth thrusters
Speed	2 m/s
Capacity	Liquid mud: 700 m3; Drill water: 2 100 m3; Potable water: 1 200 m3; Fuel oil: 4 500 m3; Bulk mud: 400 m3; Bulk cement: 250 m3;
Crew	150
Notes

Deepwater Horizon was an ultra-deepwater, dynamically positioned, semi-submersible offshore drilling rig owned by Transocean and operated by BP. On 20 April 2010, while drilling at the Macondo Prospect, a 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 marine oil spill in history.

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.

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