Watch hammerhead sharks swim in 'hurricane' around ancient volcano in rare footage

Hundreds of hammerhead sharks gather around an ancient volcano in the Pacific Ocean, drawn by cryptic signals emanating from the seabed, a new clip reveals.

Footage featured in the third episode of Netflix's new wildlife documentary series „Our Living World” shows a school of hammerhead sharks (Spirnidae) Cocos Island – A volcanic island in the eastern tropical Pacific about 310 miles (500 kilometers) southwest of mainland Costa Rica.

Cocos Island is known as a haven for endangered hammerhead sharks, but scientists still aren't sure how and why so many sharks cross the ocean to congregate there each year.

Hammerhead sharks congregate in the waters off Cocos Island. (Image credit: Our Living World)

„We don't know how these sharks do it,” Ben Roy, series producer for Our Living World, told Live Science. „We know that they have sensors on their heads, and we know that these sensors pick up the magnetic signature of these cold volcanic rocks.”

The island was formed when lava from an ancient underwater volcano erupted and solidified until it eventually rose 12,000 feet (3,660 meters) above sea level.

A young female hammerhead shark was followed by the film crew (Image credit: Our Living World)

In the episode, the crew follows a young female hammerhead shark who instinctively knows her way to Cocos Island thanks to electromagnetic signals emanating from the hard volcanic rocks on the island's slopes.

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