B. SECURITY PATROLS, SURFACE AND AIR On 10 August, the Underwater Detection Unit (Task Unit 132.32.5) was activated. This unit established and operated hydrophones across Deep Entrance and Wide Paesage. High frequency noises have been noted by this unit shortly after sunset each evening in Wide Passage. Investigation of these noises by destroyers, and divera have failed to account for their source, It is probably that the source was “Behools of fish. A surface patrol, by DDE's outside the lagoon, was commenced on 16 September using one DDE and was augmented by an additional DDE on 23 September. One DDE was assigned an anchorage in the northern emi of the lagoon near the CURTISS to provide gunfire support, if required, for CURTISS and MIXE Shot Island. The fourth DDE was assigned an anchorage in the southern end of the lagoon as standby DDE to be ready to get undervey on four hours’ notice to assiat in SAR missions or in development of corntacte. Except for a few false contacts no evidence of submarine activity was noted by patrol destroyers during the period of this report, On 16 September Task Unit 132.3.2 started airsecurity patrols. On 29 September the SS KERTOSONO, a Duteh liner, entered the Eniwetok Danger Area, but was directed out by the patrol plane almost immediately. On 10 Ostober a Japanese fishing vessel penetrated the Eniwetok Danger Area, Patrol planes could not establish contact. A destroyer was dispatched to the goene, amd contact with the vessel was established when the Japanese Captain ewan over to the destroyer for instructions. He was given instructions in English and Japanese and shown a chart pointing out a course he should follow. / 95 . _ BEST AVAILABLE COPY