The Ocean Adventures team explores the Amazon, the most powerful of the world's rivers. Part 1 of 2.

The Ocean Adventures team explores the Amazon, the most powerful of the world's rivers. Part 2 of 2.

There are places on this planet where it is a marvel that anything survives. But in the cold Arctic waters of the far north, the sea is alive with sound. The canaries of the sea are singing. They are beluga whales, named from the Russian word for "white ones." Belugaas are an evolutionary surprise -- a warm-blooded mammal in a numbingly cold sea. Resembling curious ghosts, these intelligent mammals use one of the most complex sonars of any animal. Their world is now ground zero for climate change.

Plot of this episode is not specified yet.
Please check back later for more update.

This second of a two-part show explores the most complex marine species on the planet, our counterparts in the sea, the orca, the rulers of the ocean. Part 2 of 2.