The jelly-like Portuguese man-of-war can harness sail power to fish with its deadly tentacles. Jellyfish cross entire oceans feeding on whatever happens to tangle with their tentacles. Over half of all animals in the open ocean drift in currents. Here they remain until adulthood, adrift on the high seas in relative safety away from coastal predators. They leave the crowded waters of the coast and head to the open ocean, where they use floating debris like logs as life rafts. Only recently have we begun to solve the mystery of where baby turtles disappear to in their early years. With special pressure-proof cameras, we witness record-breaking feats of endurance as they hunt for squid a kilometre down into the abyss. They live for 80 years, and we are only now beginning to learn the extraordinary complexity of their language of clicks - thought to coordinate the whole family in everything from childcare to hunting. Sperm whales have the largest brains in the world. Every animal in the big blue must find their own unique way to survive. We witness feats of incredible endurance, moments of high drama and extraordinary acts of heart-wrenching self-sacrifice. This episode reveals what it takes to survive in this savage and forbidding world. Yet it's home to some of the biggest and most spectacular creatures on earth. It's a vast marine desert where there is little to eat and nowhere to hide. The big blue is the world's greatest wilderness, far from shore and many kilometres deep.
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