Using specially developed underwater tracking time-lapse techniques, life takes a journey to the uncharted corners of the ocean. It is here that the newest discoveries are being made and the strangest creatures live, from huge spider crabs which gather in their thousands, seeking safety in numbers as they shed their protective shell to cross-dressing giant squid. Join a pack of Humboldt squid, 250 strong, hunting; see the ultimate self-sacrifice of a Pacific giant octopus mother who starves to death tending her young; and dive under the permanent ice of Antarctica to see a seething carpet of starfish as they devour a seal pup carcass.