While countries around the world continue to grapple with volatile wars, the threat of nuclear disaster and the prospect of future pandemics, there’s one secretive community nestled in the wilds of the American Midwest that has been planning for global disaster long before coronavirus struck.

The size of a small city, click or scroll on to delve inside this sprawling doomsday refuge, designed to shelter 5,000 people should the worst occur – and meet the man behind it all...