——__ oy the underground shot, Mr, Libby said he strongly suggested chat the undergornd shot not be eliminated from the test series and said he was convinced there is no veal danger that the shot vould cause an earthquake, The knowledge gained fxom tuis shot alone, Mr, Libby saic, would be of greater future importance chan that gained from ell other shots in the series, He said ne lid not believe this particular shot could be successfully zarried cut in the Pacific, because the coral structure oi the atolls differs greatly from the soil structure in the U.S. wr, Libby added that he believed seismologists should continue zo be consulted about the possible effects of an underground shot, but that the letter to the President should nct indicate any uncertainty about this shot being carried out, The Comnissioners agreed to delete izom the letter the word ‘'tentative’’ 38 it refers to the underground shot. The Commissioners then discussed and agreed upon several revisions to the press release on Operation PILGRIM, wr, Strauss requested that a statement be included to the effect hat high yield weapors of the type tested at Eniwetok FP roving 2rounds are not tested in Nevada, They also agreed that the -eference to the use of captured balloons during the test operation should be deleted from the press release. The ~ommissioners also discussed the amount of press coverage vhich should be permitted for Operation PILGRiM and agreed hat the press release should indicate that there will be limited m-site press coverage, They requested that recommendations om this subject be submitted later, Mr, wurray said he believed ."rangements should be made for press attendance at as many shots as possible, . The Commissioners next discussed the problem of allout as it relates to Operation PILGRIM and the radiological afety criteria for the Nevada Test Site, s.r, .wiurray suggested hat rather than state in the public announcementthat ‘'Every -ffort will be made to limit fallout on populated areas around he test site so that radiation exposure to the public will not “xceed 3.9 reoentgens in any one year.’’; that the announcement tate simply that fallout will be limited so that radiavion expcsure - 786 -