Here is a photograph of our Crystal Cave being used in the excavation of the Dowell Site in January 1989. This structure made doing Archeology in the winter not only feasible but even pleasant. It is easy to assemble and easy to move. The only problem we had was in high winds when it blew away. This was solved by using Tee fence posts and ropes to hold it down. It has since held up and stayed in place in sustained winds of 30-40 mph.