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Transocean Marianas
''Transocean Marianas'' is an Earl & Wright Sedco 700 design semi-submersible drilling unit capable of operating in harsh environments and water depths up to using an , 15,000 psi blowout preventer (BOP), and a outside diameter (OD) marine riser.
''Transocean Marianas'' currently operates offshore drilling activities in Namibia under contract from HRT Participações em Petróleo S.A. Throughout her career, she has operated under several names: ''Tharos'' from 1979 to 1994, ''Polyportia'' from 1994 to 1996, and ''P. Portia'' from 1996 to 1998.
On October 7, 2009, it began drilling on the Macondo well in the Gulf of Mexico. On November 9, 2009. it was damaged by Hurricane Ida. It was replaced by the ''Deepwater Horizon'', which was responsible for the Deepwater Horizon oil spill when that rig exploded on April 20, 2010.
==''Piper Alpha'' incident==
In 1988, as ''Tharos'', the vessel operated as a large firefighting, construction, diving support and accommodation vessel equipped with a helicopter and a hospital ship with 22 beds, that rescued survivors from the ''Piper Alpha'' oil platform disaster. The vessel carried out firefighting on the night of the disaster and supported the fire fighting and well kill operations that led to the extinguishing of the blaze. However, flaws in the design of the vessel's extensible rescue arm prevented it from rescuing crew from the platform, while errors in the operation of the water cannon delayed their use. Divers from ''Tharos'' recovered many bodies from the seabed and from the galley area of ''Piper Alpha''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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