Despite all the luxury and impressive technology, it's hard to ignore the grim reason these structures exist in the first place. If the idea of the world’s 0.1% burying their heads in the sand in the face of global disaster while the rest of the population is left to cope with the fallout sounds unfair or socially stratifying, well, it's meant to.

Principal Oppidum architect and designer Marc Prigent makes no bones about the fact that these bunkers aren't for everyone, and describes his desired clients as "the most powerful individuals in the world".

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Inside the $100m luxury bunker designed to protect the rich and famous