I think the sides are, since it is a tube through lava. There are stories of the tops collapsing when people have walked across the ground above the tunnel. One story tells of a man that disappeared, his body was found months later in a lava tube under his property. He fell about 30 feet.
I think the sides are, since it is a tube through lava. There are stories of the tops collapsing when people have walked across the ground above the tunnel. One story tells of a man that disappeared, his body was found months later in a lava tube under his property. He fell about 30 feet.