VIDE containment data report

The VIDE event was detonated in hole U8k of the Nevada Test Site as indicated. The device had a depth-of-burial (DOB) of 327 m in the bedded tuffs of area 9, about 200 m above the Paleozoic and the standing water level. Stemming of the 1.83 m diameter emplacement hole followed the plan. A log of the stemming operations was maintained by Holmes & Narver. Detonation time was 07:35 PDT on April 30, 1981 and 53.5 minutes later a subsurface collapse or stemming fall to a depth of about 180 m occurred. No radiation arrivals were detected in the emplacement hole above the bottom stemming plug and the VIDE containment was considered successful