Discovery is a Scientific Documentary programme.

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Discovery: Obsessed with the Quest: Humpback Heat Run

Series 1, episode 0

Underwater cameraman Roger Munns recounts his journey to Tonga to film the biggest courtship ritual of the animal kingdom, the humpback heat run. Also, Victor Vescovo describes his longest solo dive to the lowest point on Earth - the Challenger Deep at the bottom of the Marianas trench in the western Pacific