Gulf Driller IV Jack up Drilling rig is with the length of 59.745meters, width of 55.78meters, and depth of 7.62meters; the leg length of 125meters, the maximum working depth of 91.44meters, the maximum drilling depth of 9144 meters; specified accommodation of 110persons and classed by ABS. The Friede & Goldman provides the basic design, CIMC Raffles independently complete the detailed design and the construction design. Ocean Challenger is responsible for the whole supervision and management.