It's the very definition of a hidden home; invisible to the world. From the outside it could be mistaken for a prison camp, thanks to its concrete and barbed wire perimeter fence, as well as the almost 44,000 square feet of above-ground office, apartments, warehouse buildings and its very own train depot. However, behind those doors lies an indestructible silo, with plans for some of the most luxurious properties money can buy.

Buying a Vivos shelter is a pretty competitive process and is based on a co-ownership model. To be considered as a co-owner of a shelter, you have to apply to become a Vivos member, where you’ll then be added to a giant pool of members from which somebody will be selected as the 'best candidate' for each shelter.

Inside a luxury underground bunker designed for the super-rich