On private land in the western U.S., Coster-Mullen found this fragment of what he believes is bomb casing from a test version of the Fat Man design.

It took decades, but John Coster-Mullen has pieced together specs for America's first nuclear bombs. Some believe his odyssey says something about North Korea's rapid nuclear progress

From the article: North Korea Designed A Nuke. So Did This Truck Driver

On private land in the western U.S., Coster-Mullen found this fragment of what he believes is bomb casing from a test version of the Fat Man design.

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