Diving in the Arctic Ocean with Adam Ravetch

Arctic underwater cinematographer Adam Ravetch discusses the beauty and danger of diving in the frigid Arctic Ocean, as he does in the IMAX 3D film, TO THE ARCTIC - presented by oneworldoneocean.org/movement
For more information on Arctic wildlife, see the new IMAX® film "To The Arctic 3D" opening in select IMAX Theatres starting April 20, 2012. "To The Arctic 3D" is a MacGillivray Freeman Film from Warner Bros. Pictures and IMAX Corporation. Presented by One World One Ocean Foundation.

[@owlcritic]

so, why not use full face mask? yes you would use more air, but with twin 80's you could off set that. so, why not?