Another unusual fact. The bomb was at the top of a tower to simulate an air dropped explosion. You would think it would have dug out a crater in the ground but that did not happen. The air between the bomb and the ground acted as a cushion and was slammed against the ground and did depress the desert floor down in a crater shape 8 feet down. The sand was pressurized and heated into a green glass lining the whole pit with the glass. To give you an idea of the size of the pit, look at the people in the background of the monument picture, they are at the edge of the pressure formed crater. The diameter would be twice that. There is a bunker with a window that looks down 8 feet to view the glass. The crater has been back filled with sand for safety but that still did not stop some visitors from looking at the fill sure they would find some of the glass.