Swim to the underwater room

(By By Brian Lam @ Gizmodo) A Nevada family of scuba divers has prototyped  an underwater fort an anchored air pocket in a net—at the secret location at the bottom of a lake in the Sierras. And it's been there for three years! It's made with vinyl, mounted under a net, mounted to an octagon of steel. I'm going to say that this is Lake Tahoe, but there are certainly many large lakes in the Sierras, so I could be very wrong