Following the explosion, the rock above the cavity may collapse, forming a rubble chimney. Farther away, there are zones of crushed, cracked, and irreversibly strained rock. ![]() The rock closest to the location of the test is vaporised, forming a cavity. The extreme heat and pressure of an underground nuclear explosion causes changes in the surrounding rock. ![]() When the device being tested is buried at sufficient depth, the nuclear explosion may be contained, with no release of radioactive materials to the atmosphere. Underground nuclear testing is the test detonation of nuclear weapons that is performed underground.
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