Photo Essay: Inside Son Doong, the World's Largest Cave - Condé Nast Traveler
Originally, Hugh thought he would want everything white, including the ceiling. "But it looked terrible!" he says. "You could see every nook and cranny of the spray foam, and it looked like any second it could start crumbling down onto your head." So they covered it with a coat of charcoal, and never looked back. "It works because the ceilings are so high, and I liked that contrast," he says.