North Atlantic: The Dark Ocean - Episode Guide

Ken O'Sullivan explores the marine life of the northern part of the ocean, beginning with the dark waters off the coast of the north of Ireland in winter.

Ken O'Sullivan travels along the south coast of Ireland searching for fin whales, finding out that their migration routes have only recently started to be documented.

Ken embraces the spirit of early explorers, and gains an understanding of some of the ocean's greatest and most diverse animals.