When geologist Jochen Knies first reached the North Pole in 1996, the journey was a violent affair of steel against thick, multi-year ice. Ships relied on favorable winds to crack the surface, and the hull was met with a constant, rhythmic grinding. By the summer of 2025, however, the voyage aboard the research vessel *Kronprins Haakon* was unnervingly quiet. Navigating to 90 degrees North, Knies and his team encountered only thin floes and vast stretches of open water—a stark transformation of the high northern latitudes.
This ease of passage is the physical manifestation of a staggering statistical decline. Since satellite monitoring began in the late 1970s, the Arctic’s summer ice cover has contracted by more than 40 percent. In less than half a century, a frozen expanse roughly the size of the Mediterranean Sea has transitioned into blue water. If current warming trends persist, the North Pole may soon face summers with no sea ice at all, a state the region likely hasn't seen in over 100,000 years.
To understand this transition, Knies and a Norwegian-German research team spent five weeks this past August drilling into the central Arctic seabed. Their mission was to find geological clues about the last time the Pole was ice-free, potentially during the Eemian interglacial period some 120,000 years ago. By reconstructing the Arctic’s deep history, the team hopes to provide a clearer map for a future where the "frozen" north is a relic of the past.
With reporting from MIT Technology Review.
Source · MIT Technology Review
