Antarctica is one of the harshest environments you can imagine. Winds can reach 200mph and the lowest temperature ever recorded was -89 degrees Celsius. But the monochrome above the waves is matched by the explosion of colour beneath them. The Southern Ocean is home to more than 9000 species, many of which can only be found there. Hannah is joined by scientist Lucy Woodall, who led the first expedition to find Shackleton's ship Endurance, and Antarctic historian John Dudeney.

Also - meet Bhakti Sharma, the youngest person and the first Asian to complete a long-distance swim in all five oceans, the most recent being the Southern Ocean.

Follow us on IG, X and TikTok for bonus content and to see what the Southern Ocean looks like under the waves: @oceanspod.

If you want to know more about the oceans and how to protect them, come and join us here: https://act.gp/life-under-water.