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Floating drilling rig "Shelf-6" in the Sakhalin region
USSR. Sakhalin Region. 1989. The floating semi-submersible drilling rig "Shelf-6" of the Far Eastern offshore oil and gas exploration expedition for deep drilling during the drilling of well No. 1, 2,750 meters deep, in the "Borisovskaya" area. The exact date of the photo has not been established. Vladislav Titov/TASS