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Ocean Giants, "Voices of the Sea" - Preview

  • Aired: 04/11/2012
  • 00:30
  • Rating: NR
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
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Ocean Giants, "Voices of the Sea" - Preview
Ocean Giants, "Voices of the Sea" - Preview
Airs Wednesday, April 11, 2012 at 8:00 p.m. ET/PT. Check your local listings.
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