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Spectacular valleys and cliffs hidden beneath the North Sea

Scientists discovered this esker (a sedimentary cast of a meltwater channel formed beneath an ice sheet), in a tunnel valley beneath the North Sea floor. The landscape is shown in an image based on high-resolution 3D seismic data. (Image credit: British Antarctic Survey)

Like a bowl of spaghetti noodles spilled across the floor of the North Sea, a vast array of hidden tunnel valleys wind and meander across what was once an ice-covered landscape. 

These valleys are remnants of ancient rivers that once drained water from melting ice sheets.

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