"A nuclear detonation was conducted below this spot at a depth of 3,200 feet. The device with a yield of less than one megaton was detonated to determine the environmental and structural impacts that might be expected should subsequent higher yield underground nuclear tests be conducted in this vicinity.
No excavation, drilling, and/or removal of materials is permitted without U.S. Government approval within a horizontal distance of 3,300 feet from the surface ground zero location (Nevada State Coordinates N1,414,340 and E629,000, Nye County, Nevada). Any reentry into U.S. Government drill holes within this horizontal restricted area is prohibited.
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