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The Rest Is Science
The Rest Is Science

The Lake At The North Pole That Stops Europe From Freezing

August 12, 2026 • 47m

Summary

⏱️ 7 min read

Overview

Hannah Fry shares fascinating insights from her recent Arctic expedition, revealing the existence of a massive freshwater lake beneath the North Pole ice sheet called the Beaufort Gyre. This hidden body of water, larger than all the Great Lakes combined, plays a crucial role in protecting Arctic ice and regulating European climate. The episode also explores why people are more likely to correct mistakes online than answer genuine questions, and examines the mathematics and psychology behind coincidences.

The Arctic's Hidden Freshwater Lake

Hannah returns from filming in the Arctic with a remarkable discovery: beneath the North Pole's ice sheet lies an enormous freshwater lake called the Beaufort Gyre. When seawater freezes at around minus 1.8 degrees Celsius, the crystalline structure expels salt ions, creating fresh ice on top and extremely salty water below. This phenomenon has been known to the Inuit for thousands of years, who could identify safe-to-eat ice by its appearance, but European explorers in the 1500s were often on the brink of dying of thirst, surrounded by drinkable ice they didn't realize was fresh.

  • Hannah brought back a bottle of water from 4,302 meters beneath the North Pole ice sheet, which tastes extremely salty
  • When seawater freezes at minus 1.8°C, salt ions are expelled from the crystal lattice, creating fresh ice
  • Indigenous Inuit people knew for thousands of years that older, thicker, blue-glowing ice was safe to drink
  • European explorers like Martin Frobisher in 1578 were shocked to discover frozen seawater was fresh, nearly dying of thirst before making this discovery
  • One company, Svalbardi, now sells melted Arctic iceberg water for 100 euros per 750ml bottle
" If it's first year ice, if the ice is really flat and it's a little bit grey and it's got these sharp and jagged edges, then don't. But if the ice is thick, it's sort of multi-year ice. If it's more rounded at the edges, also if it glows slightly blue, then you're fine. "

The Beaufort Gyre: Climate Guardian and Threat

The Beaufort Gyre is a massive spinning freshwater basin beneath Arctic ice, larger than all the Great Lakes combined, formed by meltwater from Siberia, Greenland, Canada, and Svalbard. This cold freshwater layer acts as insulation, preventing warm Atlantic water from reaching and melting the ice sheet from below. However, as the ice melts from above due to climate change, the gyre is growing larger, threatening to disrupt the Atlantic current that keeps Europe's winters mild.

  • The Beaufort Gyre contains more freshwater than all the Great Lakes combined
  • The Arctic Ocean floor forms a perfect bowl shape that contains this spinning freshwater blob due to the Coriolis effect
  • The cold freshwater insulates the ice sheet from warm Atlantic water that would otherwise have enough energy to melt all Arctic ice
  • As the ice melts from above, the gyre is growing and could shut off the Atlantic current by 2070
  • This could end mild winters for Europe, requiring dramatic infrastructure changes in countries like Britain
" The only reason why it doesn't and hasn't is because this cold water blob is stopping it from getting there because because the salt water even though it's warm sinks to the bottom beneath the much lighter cold fresh water so it can't get to the ice sheet it's like it's like insulated perfect insulation "
" Really, Brits are happy between plus five and plus 25. That's it. That's all. That's all we're happy with. You know, if it gets over 25, we break down. If it gets under five degrees, it's game over for us. "

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