L | CHAPTERIl, SECTION 7 ions, which by the very nature of this type of work are hazardous. This also resulted in economy ofinstallation, testing and maintenance. For the foregoing reasons new submarine cables for OPERATION CASTLE were laid in shallow waters. For OPERATION GREENHOUSE some cables from OPERATION SANDSTONEwere utilized and for OPERATION IVY both SANDSTONE and GREENHOUSEcables were utilized. In a sense the submarine cable system at Eniwetok Atoll “grew” from a system originating with OPERATION SANDSTONEandresulted in providing for separate cables for telephone andsignal or control circuits. In planning for OPERATION CASTLE at Bikini it was decided to provide for both telephone andsignal or control circuits in one cable system. This required special splice boxes to provide inductive loading coils for the lines used for telephone trunking. However, the use of one cable for the combined circuits permitted a reduction of approximately 50% in cable requirements. The saving in cost of installation was directly proportional to the reduction in length of cable used. Figure 2-225. At the request of the Manager, Eniwetok Field Office on 4 February 1953, inquiries were made as to the cost and delivery dates for 90 miles of 16 pair or 45 miles of 32 pair submarine cable. A review of the replies of the cable manu- facturers indicated that a double system of 16 pair would cost 30% more than a single system of 32 pair, but that the delivery of the 16 pair cable could be made in time to assure completion within the desired schedule, whereas delivery of the 32 pair cable would be such as to delay the completion date. In addition, by using two cables of 16 pair in lieu of one of 32 pair cable more reliable “back up” circuits could be provided, as a break in a 32 pair cable in all probability would affect all 32 pair wires. This would also affect long term maintenance. In view of the foregoing reasons the Contractorrecommended to the Manager, Eniwetok Field Office the use of the two systemsof 16 pair cable in lieu of one of 32 pair cable. The specifications prepared and approved for the system in March 1953 permitted the use of plastic insulated and jacketed cable as well as the conventional and more expensive Submarine Terminal Station 3.3. Typical Page 2-227