Frozen Planet: Capturing Life at the Poles

"Frozen Planet," a Discovery Channel/BBC co-production, took four years to make and provides an in-depth portrait of life at the earth's poles as it has never been seen before. Here, a pod of orcas spy-hop through gaps in the ice in the Ross Sea, Antarctica. "It's just a view you're not prepared for. I mean, your heart is just pounding," filmmaker Chadden Hunter told "Nightline's" Bill Weir. (Chadden Hunter/Discovery Channel)