ОписаниеAEC-69-8493 NEVADA TEST AREA. . .BIG EMPLACEMENT HOLES require big bits and Atomic Energy Commission needs at the Central Nevada supplemental test area necessitated the fabrication of this monster 140-inch equipment. Holes are being drilled 140-inch inside diameter to a depth of several hundred feet, and then at 120-inch inside diameter to depths of 5,000 feet and more. In the background area sections of the largest diameter steel casting ever used for underground nuclear tests emplacement holes. It is 122 inches inside diameter with walls 3/4-inches thick and is fabricated in 30-foot lengths. The casing for the holes being drilled at the Amchitka, Alaska, supplemental test area is of comparable size. Credit: USAEC, Nevada Operations Office
Photo - Positive
![[ru-RU]Print](/Search6/Content/Images/pdf.svg){kind=small}
