Hall got the idea for the project about a decade ago, when he read that the federal government was reinvesting in catastrophe planning, which had languished after the Cold War. During the September 11th attacks, the Bush Administration activated a “continuity of government” plan, transporting selected federal workers by helicopter and bus to fortified locations, but, after years of disuse, computers and other equipment in the bunkers were out of date. Bush ordered a renewed focus on continuity plans, and FEMA launched annual government-wide exercises. (The most recent, Eagle Horizon, in 2015, simulated hurricanes, improvised nuclear devices, earthquakes, and cyberattacks.)

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