Structures on Eberiru were all within the blast crater, and because the crater was under water no inspection could be made. Station 123 ~ Wood Frame Structure. These structures on Engebi and Eberiru were not required to survive and were completely destroyed, Station 125 ~ Reinforced Concrete Slab with 1 foot, 6 inch Steel Plates, There was noydamage to the slab, but thirteen of the 1 foot, 6 inch steel plates were torn from the slab. The separation was due to the concrete's breaking out around the bolt head. Design of connection betwem plates and slab was not adequate. Station 13la - Reinforced Limonite Concrete Structure. This structure on Engebi, designed for shielding only, showed considerable failure but was not blown apart. Two horizontal cracks occurred in the structure, one about three feet from the top and the other about seven and one~half feet from the top, These cracks are about 0.5 inch wide on the lagoon side and 0.1 inch on the ocean side of structure, There was no indication that the bond between reinforcing steel and concrete was broken, but it did appear that some elongation of reinforcing steel occurred, The limonite plug blew out about two inches. The structure apparently did not break loose from its base, but the six inch concrete slab and cable were demolished, Station 131 ~ Reinforced Limonite Concrete Structure. The condition of this structure on Eberiru is unknown, The blast created a crater which filled with water, and structures in the vicinity of zero were not accessible, Stations 132a and b - Reinforced Concrete Structure. These struc~ tures showed no serious effects of blast damage, At Engebi the lagoon side wing wall of Station 132b settled slightly, and a small amount of horizontal movement of both wings was evident. The design of these structures was adequate. Stations 132c and d - Reinforced Concrete Slabs. by blast to these slabs. Station 135 - Wood Frame Structure. demolished, There was no damage The design is considered adequate. This structure was completely Design was adequate for the purpose intended, Stations 141 and 142 - Wood Frame Structure. destroyed by the blast. Station 143 ~ Reinforced Concrete Pit. by the blast. These structures were Design was adequate for the purpose intended, This structure was destroyed Design was adequate for the purpose intended. Station 144a - Reinforced Limonite Concrete Blockhouse on Reinforced Concrete Base. These structureswere designed for. shielding only. structure on Engebi was partially destroyed. The The top slab of the block was blown off and lies between the block and zero, The tubes were torn loose, and there was considerable fracture in the reat of the block but the base did not appear to be damaged, 5-312