— ee | For Umbrella,sutmerged 4/5 scale submarine model, SCUA' 29, at a range of 1600 feet, was instrumented with strain gages, pressure gages, de= flection gages, high-speed cameras, and roll, depth and flooding indicators. The hull was plastically deformed but did not rupture. Four of the ten ex- ternal ballast tanks ruptured and all were seriously dished resulting in some loss of buoyancy. SSK 3 was submerged at periscope depth and operated by its crew et 18,000 ft. from tiahoo surface zero. unmanned and located bowe-on at a range of 2900 feet. cri: /DUE yt RG formations on SSK 3 occurred from either shot. , concluslénymay Nik “7 ie In Umbrella, SSK 3 was No permanent hull de- The following preliminary be made: aw PIGE Z7A