A guide to the sites visited by the Oceans team in the Southern Ocean. The team go in search of one of the planet's most curious and enigmatic creatures. The team also explore the iconic kelp forests to investigate how they're being threatened by the rise in sea temperatures and a new predator. Finally they enter a maze of perilous sea caves to hunt for evidence of ancient sea creatures that can reveal how this ocean formed.

• Mark Halliley
• Philippe Cousteau Jr.
• Paul Rose