Humpback whales have one of the most complex songs of all animals; scientists do not yet know exactly what they mean, but males sing vigorously during the breeding season on Silver Bank, in the Dominican Republic.
A crew of mariners, scientists and filmmakers are followed as they cast off on the Sedna IV, an oceanographic schooner, to sail around the world exploring the beauty of nature, how ecosystems work and conservation challenges facing the planet.
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