Stations 37d. e, and f - Pipe Encased in Concrete, Underground. There was no damage to these structures. Station 39 -— Reinforced Concrete Bases, be found on Engebi. These structures could not There was no serious damage to concrete on the structures at Runit; all anchor bolts were bent 90° over. Stations 40, 41 and 42 ~ Reinforced Concrete Slab, Flush with Ground. These slabs were not damaged, Design is considered adequate. stations 50a, b, c, and d and 5la, b, c, and d ~ Reinforced Concrete Slab and Wood Frame Box Flush with Ground. Structures outside of an ap- proximately 1200 foot radius from zero received no damage other than some cracking and splitting of the plywood cover on the battery boxes. Struc~ tures within an approximately 1200 foot radius of zero received consider- able damage to the wood boxes, and in most instances the concrete slabs were broken, It is believed that the design was adequate as there was no requirement that these stations withstand the effects of hlast. Station 52 - Limonite Concrete Block on Reinforced Concrete Base with Back Stay Grillage. These structures were not designed to withstand the blast; only shielding was required, and data was obtained even though the structures moved, On Engebi, this structure was severely damaged by the blast. The upper grillage was buckled about eight inches and the lower about eleven inches above the base. Very little of the base was exposed, but there was no evidence of damage. On Runit, this structure was partially damaged by the blast. The block was cracked both vertically and horizontally with cracks as wide as one-quarter of an inch. Station 53 - Limonite Concrete Block on Reinforced Concrete Base with Backstay. There was no damage to these structures. The design is believed to be adequate, Base. Station 54 - Reinforced Limonite Structure on Reinforced Concrete On Engebi, there was no apparent damage to this structure. Exposed outside corners were spalled off by flying debris. The tunnel entrance to the structure had caved in and earth had not been cleared away; therefore no inside inspection was made, On Runit, the structure was demolished by a clean-up crew prior to inspection. It was understood that the structure was not damaged except that equipment supports (unistruts) were pulled out of the walls, the tun-~ nel entrance caved in, and the walls somewhat cracked, The design of these structures is considered adequate except for the connection of the unistrut supports to the walls. station 55 - Reinforced Concrete Structure. not damaged, and design is considered adequate. 5-308 These structures were