Ocean Giants, "Voices of the Sea" - Preview

Preview: Season 30 Episode 10 | 30s

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

Aired: 04/11/12

Rating: NR

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