History
Name	GSF Development Driller II
Owner	Transocean
Operator	Transocean
Port of registry	Vanuatu, Port Vila
Ordered	2 December 2002
Builder	PPL Shipyard Pte Ltd (primary) Jurong Shipyard Pte Ltd (subcontractor) Singapore
Laid down	26 May 2003
Acquired	19 February 2005
Identification	ABS class no.: 8765515 Call sign: YJUL9 DNV ID: 29750 IMO number: 8765515 MMSI number: 576971000
Status	Operational
Notes	[1]
General characteristics
Class and type	American Bureau of Shipping: A1, AMS, DPS-2
Tonnage	30,236 GT 9,070 NT
Length	115.7 m (380 ft)
Beam	78.68 m (258.1 ft)
Draught	operating: 17 to 20 m (56 to 66 ft) Transit: 8.3 m (27 ft)
Depth	37 m (121 ft)
Deck clearance	16,016 m (52,546 ft)
Propulsion	8 × 4,300 hp
Capacity	Base oil: 730 m3 (26,000 cu ft) Freshwater: 755 m3 (26,700 cu ft) Lube oil: 71.78 m3 (2,535 cu ft) Tank ballast: 21,891.81 m3 (773,102 cu ft) Fuel oil: 3,226 m3 (113,900 cu ft)
Crew	176
Notes	[2][3]

GSF Development Driller II is a fifth generation, Vanuatu-flagged dynamic positioning semi-submersible ultra-deepwater drilling rig owned and operated by Transocean. The vessel is capable of drilling in water depths up to 7,500 ft (2,300 m) with drilling depth of 35,000 ft (11,000 m), upgradeable to 37,500 ft (11,400 m).^[2]

Development Driller II was deployed in drilling a relief well on the Macondo Prospect to stop the oil spill caused by the explosion and subsequent loss of Deepwater Horizon.^[4]