Oceans: What Lies Beneath - Episode 3

Gabrielle Walker explores why we know so little about the oceans that make up nearly 80 per cent of our planet. She considers some of the remarkable resources that the oceans have to offer - from golden treasures lying hidden in the murky depths to possible new cures for cancer and antibiotic-resistant infections. She talks to oceanographers who are only just beginning to discover the oceans' potential and asks who owns the oceans and their valuable commodities.