“We’ve seen a lot more of a focus on entertainment,” said Al Corbi, who has been at the forefront of secure luxury for 50 years as the president and founder of SAFE (Strategically Armored & Fortified Environments), based in Virginia, in the US. “If you’re going to be able to survive underground, we want you to be having fun.”

Corbi, who helped secure a 27-floor private home in Mumbai for the billionaire industrialist Mukesh Ambani (whose son Anant recently made headlines with his lavish wedding celebrations), is currently working on a sprawling house on a 200-acre wooded plot, at an undisclosed location in the US (he is understandably tight-lipped about many aspects of his work).

The house itself, Corbi said in an interview via Zoom, is ultra-secure with the blast-proof doors, unbreakable windows and biometric door-entry systems. Then there’s the 30-foot-deep moat with a swing bridge, the water canons capable of taking out helicopters, drones or skydivers, and the film of flammable liquid that can be automatically deployed across the surface of the artificial lake and ignited to create a defensive ring of fire.

"Look at medieval times, a moat is one of the greatest deterrents,” said Corbi. “But they didn’t have jet skis back then.” Corbi’s client, a business mogul and avid watersports fan, saw a dual use for his moat and plans to use it as a race track for his alpha pals, too.