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Until now we've only touched the surface! We know more about the surface of the moon than we do about the deep oceans, yet the sea covers two-thirds of our planet. The Blue Planet: Seas of Life reveals the sea and its communities at their most fearsome and alluring. The Blue Planet: Seas Of Life - Part III: 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. Coral Seas - Bathed in bright sunlight and warm, clear water, the coral reef is a rich oasis of life- the rainforest of the sea. Bizarrely adorned harlequin shrimp carry of a starfish several times their size, while haunting songs reverberate around the reef, heralding the arrival of humpback whales. Shimmering schools of brightly colored fish battle for territory in this competitive world where you have to stand out to survive. The Blue Planet: Seas of Life - Part IV - Tidal Seas - The sun and moon move billions of tons of water with every turn of the tide. The strongest tides empty entire bays, smash trees on riverbanks, and strand sea creatures on suddenly dry land. Weaker tides control the movements of huge numbers of fish, coaxing schools of giant stingrays through astounding underwater arches. And as the water recedes, the tide can create unbelievable landscapes- like a sparkling world of salt crystals inhabited only by tiny shrimp and bright pink flamingos. Coasts - From rocky cliffs to gentle dunes, the coasts are always changing. Day in and day out, they are battered by crashing waves. Seabirds come here by the thousands to nest, while baby turtles hatch and race to the sea, pursued by hungry predators. Young sea lion pups are born and play on the sand- until a killer whale attacks, crashing in on the surf. But when breeding season is over, life returns to the sea and the shores are empty once again.