link to Forbes article from 2017:
https://www.forbes.com/sites/jimdobson/2017/06/10/the-shocking-doomsday-maps-of-the-world-and-the-billionaire-escape-plans/?sh=4742e10e4047
and
https://www.forbes.com/sites/jimdobson/2015/06/12/billionaire-bunkers-exclusive-look-inside-the-worlds-largest-planned-doomsday-escape/?sh=590939b0306f