CHAPTER IV, SECTION 4 seas prevailing. Remedial measures by H&N forces consisted of replacing the mooring gear with heavier tackle. At Bikini Atoll the plant- ing and mooring of the instrument cans of the 148 series was accomplished by the U.S. Navy. This work was undertaken at Eniwetok Lagoon by the H&N Marine Department. ASSISTANCE TO LARGE VESSELS. All navy tankers tying to POL buoys were assisted by LCMs. The sea mule at Eniwetok and an LCM at Bikini were used to pass the POL sub- marine hose to the tanker and, on completion of delivery of fuel, to relay properly the hose on the bottom. In all beachings of LSTs, these vessels were assisted in making the mole and retracting from the beach. HOUSEBOATS. LCUs were fitted out and operated as houseboats for the initial phases of all beachhead landings; to house and sustain two scientific groups off Dog-George area after 1 March 1954; and as a station vessel off the Flora Crater for the Nectar event. The boats were adequate for these uses and eliminated considerable lost time that would have resulted in traveling to and from an established camp or large vessel. UNDERWATER PIPING. The Marine De- partment was responsible for maintenance of all submarine piping. In this connection two lines were laid to the POL farm on Sugar, one Jet Fuel line added to the POL farm at Fred, and considerable work undertaken in repairing DATE DEPTH IN FEET Jan. 5, 1953 110 - 120 Apr. 29, 1953 110 - 120 Apr. 29, 1953 Apr. 30, 1953 110 - 120 110 - 120 Apr. 30, 1953 Apr. 30, 1953 May1, 1953 110 - 120 110 - 120 111 - 120 May May May May Feb. 111 110 110 110 90 1, 1953 2, 1953 2, 1953 2, 1953 23, 1954 Feb. 23, 1954 Feb. 24, 1954 Feb. 24, 1954 - 120 120 120 120 100 90 - 100 80 - 90 80 - 90 existing POL lines in Eniwetok Lagoon. Prior to the arrival of tankers, all POL lines were tested by applying 80 lbs./sq. in. hydrostatic pressure. The steel piping developed a number of leaks which were repaired by using rubber patching clamped to the piping. This piping in all probability will require replacement in the near future. Considerable trouble was experienced with sea moss and trash from vessels at anchor; this foreign matter entered the CMR power plant sea water intake. To lessen this condition, a 90° vertical gooseneck was installed on the lagoon end of this intake. DIVING OPERATIONS. All diving operations were performed by volunteers who could definitely prove previous schooling and experience. These men were given a thorough physical examination by the Jobsite doctor prior to being qualified as divers and were re-examined quarterly. The deep sea diving operations required during OPERATION CASTLE were largely concerned with the POL submarine hoses, due to the foul bottom. Skin divers were used for shallow water diving in connection with work on underwater piping, hull inspection, inspection of ground tackle for small craft moorings, submarine cables and waterborne Scientific Stations. The record of deep sea diving operations, which were limited to a depth of 130 feet, for OPERATION CASTLEfollows: DESCRIPTION OF JOB Recover POL saddle Elmer and connect new chain and buoy. Disconnect hose from bent pipe and flange buoy off hose. O. W.O. #578, POL Eniwetok. Same as above. Lay in three sections of hose and connect up to steel pipe. #578, POL Eniwetok. Sameas above. Same as above. Add onesection of hose to POL line and connect to steel pipe flange. O. W. O. #578, POL Eniwetok. Sameas above. Sameas above. Same as above. Same as above. Place chain weights on jet fuel lines POL Eniwetok. Same as above. Same as above. Sameas above. Page 4-45