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| Keywords: NTS - Big Hole Drilling 012.jpg Drill Yard located at the junction of Pahute Mesa Road and Tippapah Highway in Area 1 This area contains drill equipment used to bore large diameter shafts for underground tests During the period 1961 to 1992 a total of 1 5 million feet 280 miles of 36-inch-diameter holes were drilled at the Nevada Test Site Big Hole drilling holes larger than 36 inches in diameter was essential for the nation's nuclear testing program Holes as deep as a mile were drilled to accommodate large diagnostic packages Some diagnostic packages were as long as 200 feet To prevent the package with the test experiments from binding or catching on the sides of the hole it had to be drilled straight This was achieved with a drilling assembly weight pictured of 160 000 pounds 10 000 pounds was supported by the bit and 150 000 pounds was suspended by the drill pipe to keep the hole straight Nevada Test Site Guide http //www nv energy gov/library/publications/historical/DOENV_715_Rev1 pdf DOE/NV-715 Federal Government of the United States PD-USGov Nevada Test Site Big Hole Drilling | ||||
