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Keywords: NTS - Big Hole Drilling 006.jpg en Nevada Test Site Large diameter bits are used to drill Big Holes at the Nevada Test Site Big holes measure from 36 to 144 inches in diameter with depths from a 500 to 5 000 feet Above the bit are massive steel collars measuring just a few inches less than the bit and weighing up to 450 000 lbs 801 NF-1411 Federal Government of the United States PD-USGov Drilling machines Drill bits Men with hard hats Nevada Test Site Big Hole Drilling |