Takeaways from the AP's reporting on nuclear bunkers

Global security leaders are warning that nuclear threats are growing as weapons spending has surged around the world. At the same time, private bunker sales are on the rise globally. Critics warn these bunkers create a false perception that a nuclear war is survivable. They argue that people planning to live through an atomic blast aren't focusing on the real and current dangers posed by nuclear threats, and the critical need to stop the proliferation of weapons of mass destruction.

Meanwhile, government disaster experts say bunkers aren't necessary. A Federal Emergency Management Agency's 100-page guide on responding to a nuclear detonation focuses on having the public get inside and stay inside, ideally in a basement and away from outside walls for at least a day. Those existing spaces can provide protection from radioactive fallout, says FEMA.

Here are takeaways from the AP's reporting on bunkers and the debate over the message building bunkers sends.

What is the market for bunkers in the United States?

The market for U.S. bomb and fallout shelters is forecast to grow from $137 million last year to $175 million by 2030, according to a market research report from BlueWeave Consulting. The report says major growth factors include ''the rising threat of nuclear or terrorist attacks or civil unrest.''

''People are uneasy and they want a safe place to put their family. And they have this attitude that it's better to have it and not need it then to need it and not have it,'' said Atlas Survival Shelters CEO Ron Hubbard. He says his bunker factory, in Sulphur Springs, Texas, is the world's largest. Hubbard said COVID lockdowns, Russia's invasion of Ukraine and the outbreak of the Israel-Hamas war have driven sales.

What do government disaster preparedness experts say?

After a deadly and deafening blast, a bright flash and a mushroom cloud, it will take about 15 minutes for the radioactive fallout to arrive for those a mile or more away from ground zero, said Michael Dillon, a scientist at Lawrence Livermore National Laboratory.

''It's going to literally be sand falling on your head, and you're going to want to get out of that situation. You want to go to your most robust building,'' he said. In their models, they estimate people may need to stay inside for a day or two before evacuating.

What do nonproliferation advocates say?

Nonproliferation advocates bristle at the bunkers, shelters or any suggestion that a nuclear war is survivable.

''Bunkers are, in fact, not a tool to survive a nuclear war, but a tool to allow a population to psychologically endure the possibility of a nuclear war,'' said Alicia Sanders-Zakre at the International Campaign to Abolish Nuclear Weapons.

Massachusetts Congressman James McGovern year after year introduces legislation pushing for nonproliferation.

''If we ever get to a point where there's all out nuclear war, underground bunkers aren't going to protect people,'' he said. ''Instead, we ought to be investing our resources and our energy trying to talk about a nuclear weapons freeze, initially.''

Next, he said, ''we should work for the day when we get rid of all nuclear weapons.''

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The Associated Press receives support for nuclear security coverage from the Carnegie Corporation of New York and Outrider Foundation. The AP is solely responsible for all content.