A record-breaking dive into the Antarctic's crushing, freezing depths

Nature · Published 11 October 2026 Swipe more like this →

In short: To capture the hidden life of the Southern Ocean, a crew embarked on the first-ever dive to 1,000 metres in the Antarctic. Inside a cramped, freezing submersible, marine biologist Jon Copley faced the constant risks of leaks, fires, and falling rocks to bring these deep-sea wonders to light.

This expedition was not merely a cinematic endeavor; it involved marine biologist Jon Copley from the University of Southampton, UK, serving as a scientific adviser. The mission aimed to showcase the diverse creatures of the deep sea, providing an intimate look at an environment rarely seen by humans. This mission was supported by the US Navy’s deep submergence unit during a previous expedition in the north-east Pacific. Such military-led training often involves intense psychological pressure for scientists.

Operating a submersible at such depths presents extreme physical and psychological challenges. The interior of the vessel is described as cramped and cold, necessitating long periods of confinement. For dives targeting hydrothermal vents—which typically reside at depths of 2,000 to 5,000 metres—the journey can last between 8 and 12 hours. During these extended missions, crew members must manage basic biological needs in highly restricted ways, such as using a bottle for urination. Submersible pilots frequently face health complications like kidney stones. This often occurs because they limit their fluid intake to avoid using bottles.

The technical risks are substantial. Beyond the immense water pressure, crews must contend with the potential for internal fires, leaks, and falling rocks. These dangers highlight the extreme nature of deep-sea exploration. While the footage provides a window into a pristine world, the series also serves as a vital warning regarding human impact on the oceans, specifically the growing threat of plastic pollution. The immense pressure of the ocean is what keeps the hatch firmly in place. Without this force, opening the door would be impossible.

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