Planet Earth: Blue Planet II

BBCA | 9:00 pm

The new episode "Blue Planet Now: Whale Sanctuary" finds host Chris Packham in Mexico, where he teams up with scientists at the biggest whale nursery in the world for a happy event: the arrival of gray whale mothers and their babies. Elsewhere, Steve Backshall is diving in the Bahamas with such big ocean predators and tiger sharks, and Liz Bonnin sets up base at a research center near the fragile Great Barrier Reef to monitor some of the colorful marine life that calls this place home.