The team continue to investigate marine life. We also go to Atlantis, a deep sea research vessel, as it launches a sub that will help assess the health of the deep ocean.

Deep in Alaska, the primal way lives on. Fight the freeze, brave the wild, hold on to your sanity. And winter is no wonderland when temperatures plummet far below zero. This series follows the drama and hardships experienced by Alaskan households in different corners of this merciless territory as they battle to survive, thrive, and live life on their own terms.

Ben Fogle travels round the world to visit people who have given up the rat race.

Alexander Armstrong discovers both the rich culture and beautiful beaches of Sri Lanka. During his trip, he visits Sinhalese areas in the central and southern regions as well as the less-travelled Tamil north.