A nuclear blast equation used by the US military for decades to guide the construction of bombproof shelters is not always accurate, according to a new study by Chinese researchers. The equation estimates the impact on the ground following a nuclear weapon explosion, but computer simulations found the results could be unreliable if the blast occurred close by, potentially making the underground structure vulnerable. “The larger the explosion, the smaller the distance or depth, the greater the error,” … – South China Morning Post