civil defense tests

In Operation Doorstep, conducted during the larger Operation Upshot-Knothole nuclear bomb test, mannequins are seated at a table in the dining room of house number two, attending a “dinner party” thrown by Civil Defense officials who are testing the effects of an atomic explosion on houses and occupants on March 15, 1953. 

After the blast, mannequins lie strewn about the room, their “dinner party” interrupted violently by an atomic blast on March 17, 1953.

The ‘after’ image was taken opposite the ‘before’ image location. (via The Atlantic)

Both homes in the study were constructed in such a way as to minimize the thermal effects of the bomb [Shot Annie - 16 kilotons], with an eye towards determining if, in the absence of fire, the basement of the closer home — 3,500 feet (1,100 m) from the hypocenter — might shelter its occupants, while the second — at 7,500 feet (2,300 m) could remain standing. Both homes performed as expected under the conditions of their construction.  - wikipedia