permitted land transportation from construction camps to proposed zero points, thus allowing more time during the workday to be expended on the job rather than in commuting by water from base islands. Some artificial islands were created as shot points and instrument locations. Floating data-collection stations compensated for area. the lack of land These were used extensively in the nuclear radiation program. An- chored rafts and buoys, serving as fallout-collection stations, were placed in the lagoon and in the open sea. collectors. Ships also acted as fallout These offered the advantage of moving to the most desirable collection areas, that is, areas of heaviest fallout, and following the fallout within the limits of their speed. Two ships were modified for remote Operation and control from other locations or below decks, where heavily shielded quarters protected skeleton crews and scientific parties. Barge-mounted test devices, a technique first used in CASTLE, also compensated for the lack of land at the PPG. This allowed the available land area to be used for the placement of measurement instrumentation and reuse Of the same burst point without the long delays required for radiological cooling by ‘natural decay and expensive and long decontamination procedures, as described for the GEORGE crater of Operation GREENHOUSE. Reuse of zero points also allowed use of instrument locations and recording shelters for multiple tests, saving construction costs and time and increasing test-scheduling flexibility. The use of shot barges, however, precluded the acquisition of some weapon development data that required a precise line of sight between the test device and the recording instrumentation. Barge movement by lagoon currents was minimized by special mooring techniques, but not to the degree necessary for some measurements. The barges also precluded use of the pipe runs required for some other diagnostic measurements. Shot barges fitted well into the two-atoll testing scheme that was deve oped for CASTLE. Enewetak was the base of operations and Bikini was 52