Preview "Coasts," the most action-packed episode of "Blue Planet II," with crab-hunting eels, tuna-herding sea lions, and fighter-pilot puffins.
Preview Saturday's "Green Seas" episode with an octopus as clever as Sherlock, a spider crab as heroic as Jon Snow, and rafting sea otters.
This week's "Big Blue" episode features amazing footage of a mourning pilot whale, a sperm whale and her calf, a pregnant whale shark, and a Portuguese man-of-war.
With jaws as sharp as daggers, it waits burrowed in the sand. In an even more surprising twist, tiny bream fish team up to fight back. Watch a sneak peek.
The first Antarctic dive to 1,000 meters, sharks feeding on a whale carcass, and cannibal squid — producer Orla Doherty offers a preview.
Executive producer James Honeyborne offers a preview of the moments that will wow you in the Jan. 20 premiere, "One Ocean."