Ocean Giants, "Voices of the Sea" - Preview
Humpback whales' songs carry thousands of miles, while a sperm whale scans the ocean depths with a sonar laser beam louder than a thunderclap. "Voices of the Sea" reveals a surprising underwater world where sound takes the place of sight. 4/11/2012
The full episode is no longer available for online streaming. Why?
Please continue to enjoy extra(s) from this episode. The full episode is still available for purchase through the "Buy Now" links.