Milrow Nuclear Test Site, Alaska

One of three underground nuclear tests performed at different places on this 42-mile long island in the Aleutian Chain. This 1969 test, named Milrow, consisted of an 1.2 megaton-yield bomb, detonated at the bottom of a 4,003-foot shaft. The test was part of a calibration program conducted to measure the island's responses to high-yield nuclear tests, in anticipation of another larger test, code-named Cannikin. The island of Amchitka was a military outpost in WWII, and the air field and base camp from that facility were reused for the nuclear testing program.