![]() Filming in the deep ocean required the use of special submersibles. Meanwhile, in Monterey Bay, orca were documented trapping grey whales and killing a calf. Near the coast of Natal in South Africa, the team spent two seasons attempting to film the annual sardine run, a huge congregation of predators such as sharks and dolphins that assembles to feast on the migrating fish by corralling them into 'bait balls'. Off Mexico, the behaviour of a flock of frigatebirds guided the cameramen to a group of sailfish and marlin: the fastest inhabitants of the sea. After six weeks, the crew chanced upon a school of spinner dolphins, which in turn led them to a shoal of tuna. The open ocean proved more difficult and over 400 days were invested in often unsuccessful filming trips. The camera team spent three years on standby, using a microlight to land on the water nearby when they finally caught up with the creatures in the Gulf of California. The producers were helped by marine scientists all over the world with state-of-the-art equipment.īlue whales - whose migration routes were previously unknown - were located by air, after some of the animals had been given temporary radio tags. Besides witnessing animal behaviour for the first time, the crew also observed some that were new to science. The fact that most of the ocean environment remains a mystery presented the production team with many challenges. The series took almost five years to make, involving nearly 200 filming locations.
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