Sea Trek S01E01 - The Galapagos Islands

As inquisitive sealions mob the strangely garbed divers, their boisterous play threatens the delicate cameras and cables.

These tropical islands are full of surprises - penguins fly past colourful coral gardens in pursuit of clouds of tiny fish. At high tide, the explorers follow marine iguanas through pounding surf to watch them feed on submerged seaweed. And, in deeper water, they hold their breath as the hammerhead sharks arrive.