Inside an underground facility where the U.S. tests nuclear weapons
Briefly

Since the early 1990s, the U.S. has refrained from nuclear testing, relying instead on high-powered supercomputers and underwater experiments to simulate the effects of nuclear detonations. However, there are increasing indications that the major nuclear powers, including the U.S., Russia, and China, may be preparing to resume actual testing as all three are modernizing their respective nuclear test facilities. NPR's Geoff Brumfiel highlights recent observations made during a tour of the underground PULSE laboratory in Nevada, shedding light on the implications of this potential shift in policy.
The U.S. has moved to simulating nuclear detonations with supercomputers instead of actual tests, while Russia, China, and the U.S. upgrade their nuclear test sites.
After a 30-year hiatus from nuclear testing, signs indicate that major nuclear powers are preparing to test again, with advances in supercomputer simulations.
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