You can't see but the bubbles, but there's a scuba diver in the water, and these kids wanted desperately to see if he was ever going to come back up, and how cool it would be if he didn't; this is the diver (I had permission to take his picture) who also had an underwater camera. He told me it was murky down there from recent rain, no good for photos that day -- but there's a huge and complicated cave under there that cave-certified divers can explore. This is at Robidoux Springs in Waynesville, MO, one of several scuba-diving spots in the great state of Missourah.
