Spectacular valleys and cliffs hidden beneath the North Sea
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.
Now, scientists have achieved the clearest view yet of these channels. They're buried hundreds of feet beneath the seafloor, and they are enormous, ranging from about 0.6 to 3.7 miles (1 to 6 kilometers) wide.
[Click image to see it in high resolution]
Full article:
https://www.livescience.com/north-sea-i ... lleys.html