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View of stern thrusters in skeg of Global Marine Inc.'s Glomar Challenger while on ways just before the launch 23 March [1968] in yards of Livingston Shipbuilding Co., Orange, Texas. Thruster tunnels are 57 inches in diameter. Starboard screw also is visible in photo. Similar pair of thrusters is located in bow of vessel. Computer-controlled thrusters will hold ship on station during drilling of core holes in up to 20,000 feet of water in Atlantic and Pacific Oceans during Deep-Sea Drilling Project. The Global Marine-designed ship has a length of 400 feet, beam of 65 feet, and displacement of 10,500 tons.

View of stern thrusters in skeg of Global Marine Inc.'s Glomar Challenger while on ways just before the launch 23 March [1...