The United States conducts a non-nuclear underground experiment in Nevada to improve its ability to detect low-yield nuclear explosions, according to the U.S. Department of Energy. The experiment uses subsurface chemical high explosives at the Nevada National Security Site and is described as non-nuclear.
The U.S. links the exercise to its suspicion of a clandestine test China carried out in 2020, which Washington says was “cavity-muffled” and difficult to verify through monitoring alone. Both outlets describe the motivation as reducing the technical “cover” provided by underground, cavity-muffled detonations and strengthening detection capabilities.
China denies the allegation that it conducted such testing. The coverage focuses on the technical purpose of the U.S. experiment and the broader verification dispute: the U.S. says the test improves relevant monitoring, while Beijing rejects the underlying claim about China’s alleged 2020 activity.
