CHAPTER 5,18 CONTROL AND SIGNAL CABLES The Reconnaissance Report anticipated that existing submarine con~ trol and signal cables which had been installed on the floor of the lagoon in January, February, and March of 1948 for use in Operation Sandstone would be usable for future operations. (See Plate 50 of the Reconnais~ sance Report in Appendix "A" of this report.) A cable testing procedure was established, and it was recommended that the tests of installed sub- marine cable made during the reconnaissance trip be supplemented by future cable tests to be performed at approximately six-month intervals during the ensuing two years and that approximately 219,000 feet of existing con- trol and signal cable, not installed, be tested to determine whether or not it could be used for future operations. It was also recommended that cable landings be protected by placing cables in trenches at the points where they were brought ashore and by identifying cable landings with signs. It was assumed at this time that requirements for operations would be for 188,000 lineal feet of type 115~P submarine cable from Parry to Bogallua, plus terminal boxes, strips, and locks; and 34,400 feet of underground cable for local branch circuits from timing buildings to towers on experiment islands, It might be noted that the type 115-P cable is 10 conductor, plastic insulated, cutched jute served and steel wire armored; outer diameter is 1.4 inches and weight is 1.9 pounds per foot. SUBMARINE TRUNKING CABLE Additional requirements had not been firmed up by July 8, 1949, when Supplement No. 1 to the Reconnaissance Report was released, An analysis of cable testing completed by that date indicated that most of the submarine control and signal cable installed at Jobsite would be usable, Tests made during the early months of 1949 indicated that approximately 137,000 feet of the 219,000 feet of stored cable would be satisfactory for use, Data for cable tests are presented as an exhibit at the end of this volume, On June 6, 1950, the total estimated requirements of type 115-P submarine cable were as follows: Trunking to provide signals at sites remote from Runit, the Aomon Group, Engebi, and Bogombogo 33,000 feet Extensions from Station 6 to Station 69 on Runit, the Aomon Group, and Engebi 46,000 feet Trunking from Engebi to Bogallua and Engebi to Bogombogo Total to be installed 5-246 111,000 feet 190,000 feet