I saw this over on John Nack’s Adobe blog today.  Very cool stuff from National Geographic photographer Paul Nicklen (you can get lost in the images on his site).

In case you gear heads are wondering, Paul shoots with Canon DSLRs (1Ds Mark III and 1D Mark III, along with the predecessors).  Some of his underwater gear includes Seacam housings and Ikelite strobes.  A more complete list of his gear can be found here.

The book you see pitched at the end of the clip, Polar Obsession, is on Amazon.com here.