The United States conducted a non-nuclear underground experiment at the Nevada National Security Site to improve its capability to detect low-yield nuclear detonations. The US Department of Energy stated the test, involving chemical high explosives, was specifically designed to bolster detection abilities related to an alleged nuclear test conducted by China in 2020. Washington suspects China conducted a nuclear test in 2020, but Beijing has vehemently denied these accusations. This experiment aimed to refine methods for identifying similar, low-yield events globally. Officials emphasized the simulation was entirely non-nuclear and focused on enhancing monitoring technologies. The NNSA described the activity as vital for maintaining the reliability of the US nuclear deterrent and upholding treaty obligations. The test’s timing appears to be a direct response to concerns over potential Chinese nuclear advancements.