Sedan Crater marker reads:
The Sedan test was an excavation experiment conducted on July 6, 1962. This test involved the detonation of a 104 kiloton thermonuclear device buried 635 feet underground. The Sedan test was part of the Plowshare Program, designed to explore the technical and economic feasibility of using nuclear explosives for peaceful purposes. Potential large-scale industrial applications considered at the time included the excavation of canals, harbors, highway and railroad cuts through mountains, open pit mining, and the construction of dams. The Sedan test displaced about 12 million tons of earth, creating a crater 1,280 feet in diameter and 320 feet deep. Due to its unique role in atomic testing history, the Sedan crater was placed on the National Register of Historic Places in 1994.
In 2010, comprehensive investigation was conducted to verify residual radiation levels. Information from the 2010 and prior investigations resulted in restrictions at Sedan, which are posted to prevent in advertent exposure to radiation.
Listed on the National Register of Historic Places in 1994.
Event Location: Nevada Test and Training Range.