今集將跟隨兩位享譽國際的極地潛水高手:吉爾．海納斯與馬里奧．希爾，深入北極冰層下探險，見證薄冰之下的野生動物，如何適應全球暖化帶來的影響。二人在過程中親眼目睹氣候變化對海洋生態的打擊，速度之快及程度之深，遠在預期以外。

往返加拿大北極區到格陵蘭島的四千公里奇妙旅程，記載了極北地帶的獨特風光，以及環境的急劇變化。吉爾與馬里奧排除萬難，與白鯨及獨角鯨一起在開闊的冰洋中暢暢泳，隨後越海追尋海象蹤跡，最終更與北極熊近距離接觸；畫面震撼，是對瀕危野生動物的致敬之作。

電視版本：雙語廣播（粵語／英語）

Under Thin Ice follows extreme divers and cinematographers—Jill Heinerth and Mario Cyr—on a daring Arctic expedition to see how wildlife is adjusting to changes in their habitat as a result of global warming. But things don’t go exactly as expected, and as the duo travel in search of animals, they experience first-hand the repercussions of rapid climate change.

Documenting their journey in stunning 4K as they migrate from Canada’s Arctic to Greenland and back, the breathtaking adventure begins on the breaking ice floes of Nunavut where Jill and Mario join belugas and narwhals on a spectacular dive in the open ocean. It’s a passionate and awe-inspiring testament to the splendour of wildlife at risk.

TV Version: Bilingual Broadcast (Cantonese/English)