It weighs 300,000 pounds - the equivalent of 30 African elephants. It can measure over 100 feet long. Its powerful 20-foot jaws take in 16,000 gallons of water in one gigantic gulp. It feeds on tiny inch-long krill. It creates sounds that can be heard over 1000 miles away. It is the blue whale, nature's largest, most magnificient and, until now, most mysterious creature. Once feared near extinction, the rare animal has returned to Pacific waters in numbers now estimated at 2,000. World renowned underwater filmmaker Al Giddings brings viewers on a new breed of whale hunt - an unprecedented mission to capture the first up-close film footage of a natural wonder. James Brolin narrates an expedition filled with spectacular sights, sounds and facts. Investigate the whales' impressive acoustic powers; join researchers whose dangerous task it is to attach transmitters to reclusive whales and follow formerly unknown migratory patterns for the first time.