Chasing clues from their birthplace in Baja California, Mexico, to their feeding grounds in the Artic Circle, Jean-Michel Cousteau's 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. Watch on July 19, 2006 and find out more about their migration at: pbs.org/oceanadventures.