In 1970, the AEC announced plans for another test, named Cannikin. The final detonation, the "Cannikin", was the largest underground nuclear explosion by the U.S. "Cannikin", the last test at the Amchitka facility, was detonated on 6 November 1971. Both the 1969 calibration test and Cannikin itself attracted protest. The Cannikin test faced considerable opposition on environmental grounds. The Cannikin test was too large to be conducted safely in Nevada.