oa Watney units of the Surface Security Unit. These atolls were also surveyed and resurveyed in order to establish the degree of contamination, and to establish how the fallout may have been taken up in the food chain by plants and animals. This required several returns to the atolls, which were still radiologically hot enough to require that shore parties be badged. These activities are summarized in Table 66. Table 66. Dates CASTLE evacuation and resurvey activities, March-April 1954. Ship Activity Location(s) 3 Mar Phili DDE-498) Evacuation Rongelap and Ailinginae atolls 4 Mar Renshaw Evacuation Utirik Atoll 5-8 Mar Renshaw Resurvey 8-12 Mar Nicholas (DDE-449) Resurvey (DDE-499) (DDE-499) . 6 March: Likiep, Jemo Island, and Ailuk Atoll; 7 March: 9 March: Utirik and Aon Islands at Utirik Atoll, and Bikar Island at Bikar Atoll; 10 March: Enewetak Island Island at Rongerik Atoll, and Ailingi- nae Atoll; 11 March: Tap Atol] 25-26 Mar 21-23 Apr Source: ~ Nicholas (DDE-449) Resurvey Rongelap Atoll Phili Resurvey 21-23 April: CDDE-98) Mejit Island 23 April: northern Ronge- Rongelap Atoll; Ailinginae Atoll] Reference 16, Appendix H. Rongerik remained too radioactive for continuous occupancy after BRAVO and required evacuation because of the contamination of the weather station and the Project 6.6 station there. However, because JTF 7 still required weather information from this station, it was operated intermittently to make daylight soundings before shots ROMEO and KOON by personnel flown in and out by seaplane. For shots UNION and YANKEE, personnel were 348