Liv SUBMARINE CABLES. In planning the submarine cable system for Operation REDWING, a complete survey of existing cables was made early in the program. Preliminary estimates of requirements were made, which included replacing all damaged and faulty cables and providing cable for additional circuits. Approximately one-half million feet of cable and necessary splice boxes were initially ordered for shipment to Jobsite. An engineering study established that sixteen-pair No. 19 plastic wire-armored submarine cable had physical and electrical characteristics which were generally adaptable to the requirements of the Proving Ground. For the cable pairs allocated to the interisland telephone system, medium loading was required to provide minimum attenuation of voice frequencies to a cutoff point of approximately three kilocycles. This was accomplished by 88 millihenry loading coils, assembled in cylinders which were located in splice boxes at approximate 6000-foot intervals. CHAPTERII, SECTION 4 event required the installation of 16-pair No. 19 cable from Station 2300 to Station 2200, and one 16-pair No. 19 cable from Station 2300 to Station 22, as submarine cable to be installed in the lagoon. The total cable needed for these two runs was 25,800 feet. Original requirements for the Eniwetok Atoll were estimated to be 359,600 feet, and at Bikini 328,650 feet. As the Operation developed, additional quantities were required because several sections of submarine cable developed faults and had to be replaced. A total of 449,000 lineal feet was installed at Eniwetok Atoll and 365,000 feet at Bikini Atoll. This cable was laid from specially-equipped M-boats. Approximately six 6,000-foot reels could be handied in one day, not including the splicing time. , As the signal and telephone requirements were firmed by the Using Agencies, they were consolidated and furnished to the Contractor in the form of cable allocation charts. Layout The existing submarine cable terminal at Yvonne was located in an area in which destruction was probable as a result of test events. This terminal station was therefore replaced by new Timing Station Seventy Seven, which was located near the camp area and was considered to be out of the possible destruction area of the Yvonne events. a f drawings and block diagrams, Figures 2-168 thru 2-171 were prepared, adapting the information for Jobsite installation. ae HL oy ‘ eewel oe dc OS Figure 2-165. Submarine Cable Temporarily Anchored In planning for cable installation at Bikini Atoll, it was considered that the barge events would require a major portion of new cable. The barges were to be expended in succession at approximately the same location off site George. Two 16-pair No. 19 submarine cables were required for signals and communication for each barge. The land terminal point for these cables was the submarine cable terminal (Building No. 3.3) on George. A total of approx- imately 225,000 feet of cable was allocated for the barge installations. Due to difficult trenching conditions, ero- sion, and anticipated inundation from several events, 6500 feet of 16-pair No. 19 telephone cable, which under norma! circumstances would be buried underground from the terminal building on George to the camp switchboard on Fox, was supplied as a submarine cable and installed “ad a in the lagoon. Similar conditions existing in the Tare complex and the necessity of protecting the island distribution network from the Zuni Figure 2-167. Laying Submarine Cable Page 2-183