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FILE - This June 1971 photo shows the facility and cement pad at ground zero on Amchitka Island, Alaska where a 1-megaton nuclear blast was detonated about 4,000 feet underground in 1969. Three U.S. underground nuclear tests were detonated on the island in the 1960s and early 1970s. An unknown volume of radioactive material remains in caverns blasted out by the detonations. Part of the island is designated a wilderness area. The island is closed to the public. (AP Photo)

FILE - This June 1971 photo shows the facility and cement pad at ground zero on Amchitka Island, Alaska where a 1-megaton nuclear blast was detonated about 4,000 feet underground in 1969. Three U.S. underground nuclear tests were detonated on the island in the 1960s and early 1970s. An unknown volume of radioactive material remains in caverns blasted out by the detonations. Part of the island is designated a wilderness area. The island is closed to the public. (AP Photo)

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