Amchitka Island Runway and Nuke Sites

Amchitka is a volcanic, tectonically unstable island in the Rat Islands group of the Aleutian Islands in southwest Alaska.

Amchitka was selected by the United States Atomic Energy Commission to be the site for underground detonations of nuclear weapons. Three such tests were carried out: Long Shot, an 80 kiloton blast in 1965; Milrow, a 1 megaton blast in 1969; and Cannikin in 1971 – at "under 5 megatons", the largest underground test ever conducted by the United States.

The SE end is in much better resolution close up.