Transocean Marianas was an Earl & Wright Sedco 700 design drilling unit capable of operating in harsh environments and water depths up to 7,000 feet (2,100 m) using a 47.6 cm (18.75 in), 15,000 psi (BOP), and a 53 cm (21 in) outside diameter (OD) . Transocean Marianas has operated under several names: Tharos from 1979 to 1994, Polyporti. [pdf]
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