409-th nuclear explosion. Nuclear experiment Crystal

Russia / Saha / Udachnyy /
 explosion site, tailings, nuclear testing area
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As part of a plan to create the basin for a tailings dam for the nearby diamond mine, a 1.7 kiloton atomic bomb was detonated 98 meters (322 ft) underground near Udachny on October 2, 1974. Original plans had called for eight similar explosions to be conducted; however, due to radioactive fallout being far greater than expected, the project was halted after the first blast. The shaft in which the explosion was held was not plugged until eighteen years later, with an estimated 7-to-20-meter (23 to 66 ft) thick concrete sarcophagus.
Source: en.wikipedia.org/wiki/Udachny
All Soviet explosions of 1974 - en.wikipedia.org/wiki/1974_Soviet_nuclear_tests
All Soviet Explosions of All Time - en.wikipedia.org/wiki/List_of_nuclear_weapons_tests_of_...
Explosions Database - www.johnstonsarchive.net/nuclear/tests/USSR-ntests0.htm...
Map of nuclear explosions on the Planet - www.arcgis.com/apps/Time/index.html?appid=b8540a8a25004...
Optional - www.google.com/maps/d/embed?mid=1gwYeSqImrmfWKNaT6LRdgI...
Wikipedia article: http://ru.wikipedia.org/wiki/Список_мирных_ядерных_взрывов_в_СССР
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Coordinates:   66°27'26"N   112°23'57"E
This article was last modified 3 years ago