Elbert - you are spot on! Awesome - intriguing - beautiful AND SCARY AS HELL!
When I saw him in the water with a Nitrox tank I couldn't believe my eyes. Then I see two compressed air tanks and gave a sigh of relief
I'm sorry they didn't document how many decompression stops he made. AND they should say "never try this at home!"

Harriette
Take only pictures leave only bubbles