of so smal. 4 crater ard it urove: .mpossibdle to run cross wind in sufficient. straight courses t. ta.- taut wire measuremerts effective; hence, tor two of tne three ~in. i modified procedure was develop on the spot ct. wnhicn tne cvoat's ancnor cable was marked of Was allowed ~: cr.f* gercss the -rate: anda was _aen* GPback ‘by the but priv: . o ancnor winter. ee “he post-Shot 3 aerial sur as made a few days after tc Snot +. From tr.s surve, shot a post-shot contour map snowing, of course, cnoly tne section avove tne waterline was constructed. The post-Saot 3 fatnomete: survey was made or 1 May, the 24th aad day after the snot. Snmot 4+ nac . itervened and the water-wave resulting from Shct + nad wasned over tne 1 p of the Shot 3 crater. This had the effect ¢f smoctning and lowering .ne ..p to an unknown extent (believed to be slignt;, Yilling in tne co tuum of the crater and reducing the devel oi rac.woactivity. During * © crater survey, the radiation level 10 ft arcve tne water survace wa. apo. ¢O mr/hr and above the lip 1500 mryhr t . ort Oe omrear, [nh owne postshot surve, in .ne c.cinity of Shot 4 there was a Similar pressure of time. A varg was being put into place for a later shot anc it was impossible cc app: vac. close to the presumed center of the Shot + crater. Three tau’ wlce runs were obtaiced but for the reason just stated all are cnora. *-ather than diameters. Additional data in regarc «tc tnis crater were ortained from the Scripps Institution of Oceanogrep:.., wic had run a fatnomete- survey two days previously to permit essurance to the capta.c ~ «me USS Curtiss tnat it was safe for the shi; to croveed into tne area Tue fathometer surveys in this area, as in tre vtner srate:s shcowec & ver. flat bottom, obviously the reSut of rivling-2 gq of mud smd or vine .ani te obscure the bottom of the crater. in addition tc tre Saticsete: data, information regarding lead-line dept. and iengtr of c.a.n .. dLoys and moors was obtained from the Bah 2roup resron i Lacemen* of tne narge for the later snot. ‘