Frozen Seas
An environment where only the toughest survive, the Arctic and Antarctic are unrelenting habitats. Only in spring does life begin again. Plankton blooms and feeds fast hordes of migrating fish, walruses rake the seabed for clams, and minke and humpback whales gorge themselves on gigantic swarms of krill. But it is a brief spring feast - the ice soon returns and pushes life back into the ocean.
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More from this season
S1 E1
Introduction
Experience the power of the blue whale - the largest mammal ever to grace our planet. Learn how the sun and moon help control and tame the ocean. Travel far and wide - from the Eastern Pacific to Alaska, from the Bering Sea to the shores of Southern California - and begin to understand the complexity and power of our oceans.
S1 E2
The Deep
A place of mountain ranges, perpetual night, pressures extremes and cold... and the weirdest life forms on our planet. Dive into the depths of the ocean, an eerie world where predators with teeth so large they can't even close their mouths, chase bio-luminescent creatures of the deep. Discover the spectacular smoking chimneys of the hydrothermal vents. Go deeper down than you have ever been...
S1 E3
Open Ocean
In the immense space of the open ocean the sea bed is a staggering five miles below the surface and the nearest island is over 300 miles away. Yet here live many of the most spectacular predators in the ocean. Marvel as you experience ruthless and beautiful battles between hunter and prey.
S1 E5
Seasonal Seas
As the days grow longer, billions of microscopic plankton bloom under the blazing sun. Here in the temperate seas, three-ton basking sharks graze among forests of giant kelp - the fastest growing plant in the world. The forests harbor thousands of other animals, including sea otters, brilliantly colored anemones, squid, and exquisite leafy dragons. But as the year wears on, storms rage in the icy sea... a desperate challenge for the animals that remain.