File:Operation Emery - Baneberry.jpg

Summary
Baneberry's accidental radioactive plume rises from a shock fissure. It was carried in three different directions by the wind in 1970.

On December 18, 1970, the Baneberry underground nuclear test at the Nevada Test Site released radioactivity to the atmosphere. Baneberry had a yield of ten kilotons. It was buried about 900 feet beneath the surface of Yucca Flat, near the northern boundary of the NTS.

https://en.wikipedia.org/wiki/File:Operation_Emery_-_Baneberry.jpg