The largest predator on the planet, the sperm whale, is your host for an amazing exploration of the final frontier – the world at the bottom of the ocean. From the makers of the Walking With series comes this incredible marine tour, in which you'll witness a rarely seen world of hidden mountain ranges, majestic canyons, volcanoes and the beautiful and often deadly creatures that inhabit the deep sea.

Rating: 7.4

Cast:

Bernard

Hill

Scott

MacCallum

Bernard

Hill

Scott

MacCallum

Bernard

Hill

Scott

MacCallum