siderable, the reinforcing steel being thoroughly exposed. This effect may be partly security demolition rather than blast effect; however, on the top of certain piers, where the legs of the tower emerged from concrete, short stubs of the tower legs are still remaining. There is abundant evidence of iron oxidation of the tops of various piers, and the surrounding soil area is apparently depressed. The tops of the tower supporting piers and stubs of tower legs, are intensely radio active. It is predicated, however, that this radio activity is only on the surface of the concrete mass, and penetrates very little. Paving. The only paving at the time of the previous operation was appar- ently in the radius around the 2€ro tower at Engebi. This paving was found in the condition of considerable shatter and irregularity in surface grade. It is understood to have been specified as a three-inch thickness; however, by visual inspection and by actual section taken of the paving, it does not appear that the paving is as thick as this at any point. It is not known whether the significance of this is compression from shock waves, or whether the design thickness was not achieved by the construction. that any of this original paving is salvagable. I+ does not appear The general characteristics of the paving fractures are tendencies toward uplift and shatter. Craters around original zero towers are not pronounced but the general area appears to be depressed in some degree. This was not determined accurately during the reconnaissance due to lack of instruments on which observations could be made quickly, and to the residual radio activity in the carters. It is esti- mated to be in the range of two to five feet below average terrain at the original tower position. Special Equipment on Shot Islandse Equipment in the interior of special buildings on shot islands survived the blast, but scientific equipment has been removed. However, the air conditioning units in the buildings were ex- II = 6