Until now, we've only touched theisurface… The BBC spent five years and $10 million to produce this landmark exploration of the ocean, a world we know less about than the moon. We go further out and deeper down to show you things that have never been seen before. The Blue Planet: Seas of Life reveals the sea and its communities at their most fearsome and alluring. Ocean World- Experience the power of the Blue Whale - the largest mammal to ever 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. Frozen Seas- An environment where only the toughest survive, the Arctic and Antarctic are unrelenting habitats. Only in the spring does life begin again. Plankton blooms and feeds vast 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.