In 1962, the U.S. planned a secret presidential bunker 3,000–4,000 feet underground, designed to withstand a 300-megaton nuclear strike. LBJ canceled the projec

In 1962, the U.S. planned a secret presidential bunker 3,000–4,000 feet underground, designed to withstand a 300-megaton nuclear strike. LBJ canceled the project in 1964, calling it “the stupidest idea he had ever heard.” The plan was intended to provide the president and a small group of officials…