Keywords: Layout of a typical horizontal underground nuclear effects test in Rainier Mesa 002.jpg en After a nuclear explosion at ground zero radiation passes through two closures thousandths of seconds before they shut and travels to the test chambers where experiments are irradiated The closures and the tunnel and pipe seal TAPS prevent debris from flying down the tunnel and damaging the experiments 1506 CJ-478-2 Federal Government of the United States PD-USGov Nevada Test Site underground nuclear testing Rainier Mesa |