Depth Character of Layers Hard 0-1000! 1% 1000-2000! 2000-+3000' 3000-4000! Average Firm O% Soft Cavity 99% 0% 8 18 0 17 38 4 67 ha 96 8 3 0 7 15 75 3 . A complete log of the drill nole will be available at the completion of tne project. Arrengements have now been completed to drill a second hole (Station 1131) on Parry Island. Experience with drilling the first hole will reduce difficulties on the second and it is expected that samples of tne basement rock will be obtained. Furthermore it is expected that gaps in the drill record for the first hole can be partially filled from the second. approximately 2,000 ft deep. As of 30 June this second hole was The two drill holes willprovide good control for interpreting the results of tne seismic refraction survey (Project 11.4) to be run by the Scripps Institution this fall. The possible tnird drilling locetion (Station 1132) on the coral head west of Runit has been abandoned because of the high cost of t:e drilling program and the unavailability of additional funds. The Seabee team of two officers and 12 men have left Eniwetok to return to their duty stations. The Navy pontoons of which the drilling platform was to have been constructed will be returned to Guan. Project 11.4 Seismic Refraction Survey Russell Raitt will be in charge of the refraction survey to be conducted by tne Scripps Institution. The survey will be made with two fleet tugs (ATA), one serving as the firing vessel, the other as the receiving station for the refracted seismic waves. Scientific personnel for the project will be drawn largely from the Scripps ~ a , LLL