Wildlife adventurer Nigel Marven travels over 5000 miles following grey whales as they undertake the longest mammal migration on Earth, up the Pacific coast of North America. Using sailboats, skiffs, kayaks and scuba gear, Nigel will get up close and personal with the whales and other friendly creatures.
From the warm winter birthing lagoons of Mexico, a grey whale mother and her newborn calf must travel northwards to the summer feeding grounds of the Arctic. It's a long and dangerous journey, through some of the world's most breathtaking scenery.
Up and down this coastline, Nigel meets whale-watchers and whale-worshippers, scientists and researchers - characters who share his love for these magnificent creatures. Also along the way, Nigel meets an array of critters. On land, he finds snakes, bears and eagles while alongside the grey whales swim a supporting cast of dolphins, sealions, humpbacks and orcas.