A Atomic Energy Commission (AEC), New York Operations Office USS Sioux and other vessels from TG 7.3 Operations: Water-sampling and submerged radiation-meter techniques were used to obtain fallout data in free ocean areas. Following YANKEE and NECTAR, vessels traversed fallout fields, collecting data used in conjunction with aircraft surveys conducted by the AEC. (Times involved were H+6 to D+4 for YANKEE, with completion of operations for NECTAR by 0530 on D+2.) Shots: YANKEE (Bikini): NECTAR (Enewetak). Radiation Exposure Potential: High for all personnel collecting sam- ples, less severe for those performing the aerial survey or for those shipping samples to NRDL for analysis. Staffing: Seven civilians were associated with this project; four from SIO and three from NRDL. Exposures for crews of the naval ves- sels appear in Table 59. Project Report: Reference 57. Project 2.7a -~- Radioactivity of Open-Sea Plankton Samples Agencies: Operations: Scripps Institution of Oceanography (SIO) Naval Radiological Defense Laboratory (NRDL) USS_Sioux Two samples (on 7 and 9 May) were taken from the Sioux while traversing the fallout pattern subsequent to YANKEE. Samples were collected from widely dispersed locations; but most analysis occurred in the continental United States. Shots: YANKEE (Bikini). Radiation Exposure Potential: High for all personnel involved in sam- ple collecting, both naval crews and scientific personnel. Staffing: Three civilians from SIO were associated with this project. Project Report: Reference 58. 183