From the BBC One, Big Blue Live web site:

It’s the final show from Monterey Bay and the team are aiming for the ultimate wildlife encounter with the largest animal on the planet, the blue whale. Catch up with the sea otters, sea lions, sharks and whales as Matt Baker, Liz Bonnin, Steve Backshall and Hugh Fearnley-Whittingstall conclude this extraordinary conservation success story.

Enjoy the spectacular footage.