We visit the high seas, a vast expanse of ocean that covers half our planet in a blanket of blue. And this expanse of blue is home to giant animals who navigate thousands of miles between places to feed and raise their young.
This time, we dip our toes into the shallow waters of the Pacific. We discover a remarkable dolphin display, the largest coral reef in the world, and join turtle mums-to-be in one of the world's biggest animal gatherings.
This time, we head for the cliffs, beaches and headlands of the Pacific's coasts. We discover what connects sea cows to mermaids, head onto mangrove mud with battalions of crabs, fill up on a shellfish buffet with bears, and follow salmon inland on their yearly migration to spawn.
This time, we plunge to the murky depths of the Pacific, to meet the big eyed, toothy, and transparent residents of the abyss - animals who can cope with the crushing pressure, total darkness, and volcanic violence, in the deepest place on earth.