Surf's up more than 2 miles under the sea, where ice-cold waves as tall as skyscrapers tumble over an underwater "waterfall."

In this turbulent underwater canyon, nearly 15,000 feet (4,550 meters) below the surface, the scientists spotted a set of more than 250 consecutive crashing waves, similar to surfer's waves.

It's the longest train of these special billows, called Kelvin-Helmholtz waves, ever seen in the sea

"In the deep ocean, there can be vigorous mixing processes, but if you look for these waves at the surface, they generate only a ripple. You don't notice them,"

The rift, called the Romanche Trench, drops down to more than 25,000 feet (7,600 m) deep and has 10 times the flow of the Amazon River coursing through it.

The canyon is one of the only passes through an underwater mountain range that blocks deep-ocean currents flowing along the Atlantic Ocean seafloor

Inside the passage, freezing water flowing north from Antarctica mixes with warmer water coursing above