Al Corbi is the go-to-guy when you're in the market for a James Bond villain style lair.

Doomsday prepping is nothing new, but following the revelation of Mark Zuckerberg's plans for a secretive underground bunker; described as a 5,000-sq-ft underground shelter with “its own energy and food supplies” and “what appears to be a blast-resistant door” other rich people decided they wanted to get their own 'fortified shelter'.

Sonal reached out to Al Corbi, president and founder of Virginia-based company SAFE (Strategically Armored & Fortified Environments) to find out how he became the guy that the rich and famous reach out to when they're in the market for a doomsday-proof luxury underground bunker.