Companies that provide survivalist bunkers for billionaires include: Atlas Survival Shelters (Texas), Vivos (California), SAFE (Strategically Armored & Fortified Environments) + Vital RN (Virginia), Creative Home Engineering (Arizona), and Ultimate Bunker (Utah).
Oh, and because this is The Hollywood Reporter, there's a whole bunch of stuff about fiery moats! water cannons! and rotating fireplaces right out of 'Indiana Jones'!
Billionaires' survivalist bunkers go absolutely bonkers with fiery moats and water cannons