W.J. Hennigan, Opinion | Nuclear Weapons Testing Has an Unending Legacy – The New York Times

By W.J. Hennigan.   Mr. Hennigan writes about national security for Opinion.

“ABOUT AN HOUR’S DRIVE from the Las Vegas Strip, deep craters pockmark the desert sand for miles in every direction. It’s here, amid the sunbaked flats, that the United States conducted 928 nuclear tests during the Cold War above and below ground. The site is mostly quiet now, and has been since 1992, when Washington halted America’s testing program.

There are growing fears this could soon change. As tensions deepen in America’s relations with Russia and China, satellite images reveal all three nations are actively expanding their nuclear testing facilities, cutting roads and digging new tunnels at long-dormant proving grounds, including in Nevada.

None of these nations have conducted a full-scale nuclear test since the 1990s. Environmental and health concerns pushed them to move the practice underground in the middle of the last century, before abandoning testing altogether at the end of the Cold War.

Each government insists it will not be the one to reverse the freeze. Russia and China have said little about the recent flurry of construction at their testing sites, but the United States emphasizes it’s merely modernizing infrastructure for subcritical tests, or underground experiments that test components of a weapon but fall short of a nuclear chain reaction.

The possibility of resuming underground nuclear testing has long loomed over the post-Cold War world. But only now do those fears seem worryingly close to being realized amid the growing animosity among the world powers, the construction at testing grounds and the development of a new generation of nuclear weapons.

As this pressure mounts, some experts fear that the United States could act first. Ernest Moniz, a physicist who oversaw the nation’s nuclear complex as energy secretary under President Barack Obama, said there’s increasing interest from members of Congress, the military and U.S. weapons laboratories to begin full-scale explosive tests once again. “Among the major nuclear powers, if there is a resumption of testing, it will be by the United States first,” Mr. Moniz said in a recent interview.” . . . .