Cousteau embarks on a quest to determine why North America's majestic gray whales are disappearing by the thousands. Chasing clues from their birthplace in Baja California, Mexico, to their feeding grounds in the Arctic Circle, the Cousteau team follows gray whales to observe, document, and understand the variety of natural and man-made hurdles that these creatures must overcome in order to survive. The amazing expedition unlocks seldom-seen views of tragedy and triumph along a route nearly 12,000 miles long.

Sunday, 8/17/08 from 7-8 p.m. ET