CHAPTER II, SECTION 7 paper insulated lead armored cable that had been used in previous installations. Due to the large amount of cable involved with relatively short delivery requirement, it became necessary to split the order, and approximately 85% of lead armored cable and 15% of plastic covered cable was ordered. As of 23 April 1953 when authorization was received to place the order, 775,000 lineal feet of 16 pair cable was required. Subsequently the deletion of Scientific Stations west of site Tare caused a reduction in these requirements, but the Contractor was authori- zed by the Manager, Eniwetok Field Office to accept delivery of the entire order so that it would be on handfor possible use at other locations then unknown. Drawings approved on 30 July 1953 indicated that all but 94,000 lineal feet would be required. Another departure from previous test installations was the use of reinforced concrete vaults for housing submarine cable terminals. This cable system was designed for use with several successive tests. These vaults provided for protection against blast effects and a means for ready access to the terminal boxes. They had the further advantage of providing some protection from radioactive contamination for the employees required to work at the terminals between tests. These terminal structures proved entirely adequate as evidenced by the lack of damage after the various detonations and the Figure 2-226. S.T. Station - 50% Completed Typical derground cable. The reason for the use of 51 pair underground cable for this run was that the same cable could be used to provide the signal, control and telephone needs of all the few difficulties encountered in preparing the submarine cable system for each succeeding test. islands between Tare and Oboe. This was a more economical installation than providing These terminal vaults consisted of reinforced concrete buildings with a gravel floor and a 3’ x 3’ hatch opening. Stations ST 1.1 through 1.3 and ST 2.1 were 8’ x 8’ x 7’ high and projected 1’-0” above grade. Stations ST 3.1 Tare and separate cables for all other island needs. Three telephone buoys in the lagoon were connected to the Tare telephone exchange. through 3.4 were 11’ x 11’ x 8’ high and project- ed 2’- 6” above grade. Earth fill was placed on a slope to the tops of the Stations. The location submarine cable from the control at Nan to The signal, control and telephone cable system as finally completed is indicated in the Block diagram Figure 2-227. of Station ST 3.3 was on solid coral and the building was constructed on grade. Due to the anticipated high blast pressures, this necessitated the addition of buttresses to this Station which were embedded one-foot into the coral The actual mechanics of laying of the cables were facilitated by fitting out an LCM as a cable laying and repair boat. The deck and bottom of this boat were reinforced, a gasoline engine driven winch wasinstalled alongside the wheelhouse and four davits, each carrying a large bedded in holes drilled in the coral. This Station The cable reel was placed in a special cable dolly with the reinforcing steel of the buttresses em- is shown in Figure 2-225. Each of these build- ings was equipped with a watertight terminal box for the submarine cable ends and another watertight terminal for the termination of lead covered cables which were run underground to other Stations. Figure 2-226 shows a typical terminal Station with the foundation poured and the sides formed. The system as finally installed consisted of 620,000 feet of 16 pair, 19 gauge submarine cable, running in a single system from site Able to Charlie, thence as a double system around the atoll to Oboe. From Oboe the circuits were completed to Tare via a 51 pair, 19 gauge un- Page 2-228 sheave, were placed along one side of the boat. in the well deck of the boat, and the cable then run over the winch drum from where it was paid out as the boat moved forward. The cable was laid on a designated course so as to pass over the shortest distance in shallow water be- tween the terminals. For the long run between Nan and Oboe requiring 65,874 feet of cable to be laid in fairly deep water, a helicopter was utilized for assistance in maintaining the proper course. Figure 2-229 shows men laying cable in shallow waters from a terminal station. The changes effected in laying interisland cables for the CASTLE OPERATION are summarized as follows: (1) Cables were gener-