New footage shows sharks swarming volcanoes

ABC News’ Will Reeve has a first look at the never-before-seen footage from National Geographic’s “Sharkfest.”
2:42 | 07/17/20

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Transcript for New footage shows sharks swarming volcanoes
Here we go. Back now with that eye opening discovery. Underwater sharks swarming volcanoes, thriving in hot murky water. Will reeve has the very first look at the never before seen footage from national geographic's "Shark fest." Good morning, will. Reporter: Good morning, Cecilia. Dramatic views here from our drone overhead at the Jersey shore. But not as dramatic as the finding by scientists that sharks are magnetically drawn to volcanoes. As sharks are spotted closer to swimmers this summer, scientists are discovering a blood boiling relationship. Watch out. Reporter: That fines sharks attracted to volcanoes. It's all part of national geographic's fiery new special "Schar cane foe." Sharing never before seen footage. Absolutely swarmed by sharks down here. Reporter: To explain the connection. One theory, the murky waters sometimes found nearby. That turbid water, the perfect hunting ground for bull sharks. They have an amazing sense of smell. Even though the water is murky they should be able to find and catch prey fairly easily and may have an advantage over prey that doesn't have as good a sensory You probably want to avoid murky waters or dark waters because, you know, you're not going to see a shark but they can definitely sense you. And they might mistake you for prey. Reporter: Another possible draw for sharks, their sixth sense that helps them detect magnetic feels and that laugh have is packed with magnetic to test that theory they placed magnets on the ocean floor. Just watch what happens. As far as you can see they're coming from every direction. They're crazy here. Reporter: Nothing as explosive as this. Oh. Oh, yeah. Reporter: An underwater volcano erupting. Inside the team finding something unprecedented. Live sharks swimming inside an active volcano. Did we discover a sharkano? Yeah, we did. We found sharks living in a volcano. There might not be any volcanoes near your local beach but still good to know and if you want to learn more about this phenomenon, this Sunday 8:00, 7:00 central on national geographic, it's "Sharkano" kicking off national geographic's shark fest starting this Sunday running for five whole weeks. Cecilia. I've heard of "Sharknado." Never heard of "Sharkano" but when you know you know.

This transcript has been automatically generated and may not be 100% accurate.

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