Planet Earth: episode 11-This episode concentrates on the most unexplored area of the planet: the deep ocean. It begins with a whale shark used as a shield by a shoal of bait fish to protect themselves from yellowfin tuna. Also shown is an oceanic whitetip shark trailing rainbow runners.
Meanwhile, a 500-strong school of dolphins head for the Azores, where they work together to feast on scad mackerel. Down in the ocean's furthest reaches, some creatures defy classification. On the sea floor, scavengers such as the spider crab bide their time, awaiting carrion from above. The volcanic mountain chain at the bottom of the Atlantic Ocean also sustains life through the bacteria that surround its sulfide vents
Open ocean, a vast biotope covering two thirds of the planet, some shallow, some as...