Coolness: Fishing Under Ice

In case you're wondering how this "upside down" idea works, the divers are wearing dry suits (sealed) that are inflated with buoyant air. They are floating to the surface and are bumping up against the surface ice sheet layer, then they're just spinning upside down and putting their feet against the underside of the ice. So the bouyancy in this scenario becomes "gravity" when they're upside down. That's why the bubbles seem to go down and the person filming is also upside down. It's a really neat idea and wonderfully shot, I'm sure these guys had a blast. I love the idea of emptying the bucket of air into the wheelbarrow though I am left wondering how they secure a heavy barrow to the underside of the ice... plastic perhaps?