Categorization of NTS Nuclear Tests PlacementCriterion (this document) Containment Design Criterion {sometimes used in public discussion) A. Atmospheric A. to Aboveground -- NTS Aboveground -- Bombing Range 100 5 Aboveground Subtotal (Atmospheric) 105 Subtotal B. ndergroun Shaft -- Unstemmed Hole Crater Shaft -- Shallow Buried 9 535 Subtotal (Underground) 621 Total ign 9 10 124 Ntain % 1“ Shaft -- Stemmed Tunnel Unstemmed Hole Crater B. 9 105 67 726 Shaft 535 Subtotal 602 Total 726 Tunnel 67 (1) Consists of 84 weaponsrelated or weaponseffects tests and 16 safety tests. (2) Consists of 4 storage-transportation tests and 1 safety test. (3) Nine events were conducted underground in unstemmed holes to minimize, but not eliminate, the release of radioactivity to the atmosphere. Because incandescent gases were released, these tests are sometimes referred to as “Roman candles.” {4} Ten tests were designed to be cratering tests, hence not designed to be contained. Event named Sulky, conducted on December 18, 1964, failed to produce the expected crater, but because placement wasin a shaft, albeit shatlow,it is listed in this document as a shaft test.