Keywords: NTS - Windowless Modular Structure - after.jpg Nevada Test Site Frenchman Flat <br /> This brick masonry structure shelter was built for the June 24 1957 Priscilla test The walls of the 32-foot by 28-foot building consist of two layers of brick with reinforcing steel in the center forming a thickness of 10 inches The flat roof is reinforced concrete The blast from the nuclear test displaced the wall facing ground zero east side about one-quarter of an inch <br /><br /> Photograph taken after the test Nevada Test Site Guide http //www nv energy gov/library/publications/historical/DOENV_715_Rev1 pdf DOE/NV-715 Federal Government of the United States PD-USGov Plumbbob Priscilla Civil defense of the United States |