Looking up from stairs of a test bomb shelter. Shot tower visible.
Operation Plumbbob used the tallest towers of all the tests. Some of them over 600 ft high. The structure on the top is called the "cab" and housed the weapon. Putting a weapon on top of a tower provided a more controlled experiment. Dropping them from airplanes, although done, always provide the possibility of a "miss".... oops!
Many of our NATO allies, who did not have atomic weapons, came to our tests and built various types of shelters to see how they would stand up to an actual blast. This one was built by the West Germans.
"Let's see, I think the way to the press viewing area is up these stairs and...OH SHIT!"