The team travels to the Dominican Republic in the Caribbean to reveal the greatest secrets in the lives of the North Atlantic humpback whale. Why do thousands gather in one tiny patch of ocean every year, and what lengths does it go to choose a mate? While exploring the humpbacks’ hidden world, they witness a mother defend her calf in the ultimate ocean battle with a pack of orcas.

The team is in the Azores to tag a deep-sea giant — the sixgill shark — and learn more about its nightly patterns on the hunt for food in the abyss. For the first time ever, the team tags and retrieves valuable data, uncovering the secrets of why this prehistoric shark undertakes its epic journey from the depths at night.

The team brings the OceanXplorer to Svalbard, Norway. The ice world of the Arctic is changing faster than anywhere else on Earth. The team’s mission is to figure out if Svalbard’s polar bears are adapting to its environment. To do so, they come face to face with this giant of the Arctic Ocean and scale a glacier to learn how much time is left for one of the most critical habitats for polar bears.

The team brings the OceanXplorer as far north as they can, to the edge of the Arctic ice cap. They learn how a population of bowhead whales, once hunted almost to extinction, is faring today. And they’re the first to observe the feeding strategies of the Greenland shark in its own deep-sea habitat from a sub.