Shots of three test nuclear explosions in Eniwetok, Marshall Islands.
<a href="https://en.wikipedia.org/wiki/United_States_Department_of_Energy" class="extiw" title="en:United States Department of Energy">United States Department of Energy</a>
1948
The Motion Picture Division of the U.S. National Archives. Edited highlights from <a rel="nofollow" class="external text" href="https://archive.org/details/gov.doe.0800007">Nuclear Test Film - Operation Sandstone - Blast Measurement (1945)</a>