考察隊繼續留守北極周邊地區，忍受著北極嚴冬的極端環境。他們在全日24小時漆黑之中工作，用人造衛星監察海冰情況，及研究融冰為何會自行釋放溫室氣體，對環境造成破壞。隨著太陽回到北極圈，地形也起了變化，危機四伏；冰塊變薄、碎裂，北極熊不斷來訪，加上全球疫症的威脅……意志堅定的考察隊決定作戰到最後一刻。

電視版本：雙語廣播（粵語／英語）

The team endures through the extremes of Arctic winter close to the North Pole. Through the 24-hour darkness they work to revolutionise our ability to monitor sea ice using satellites, and they explore how the melting ice is releasing its own damaging greenhouse gases. As the sun returns to the Arctic, the landscape is transformed. Facing perilous thinning and cracking ice, constant polar bear visits, and the threat of a global pandemic, the team are determined to explore the Arctic ice right until the last possible moment.

TV Version: Bilingual Broadcast (Cantonese/English)