00:00For the last 12 years, I've tagged and tracked about 50 bull sharks.
00:07Push it away from the boat.
00:09I've discovered some extraordinary patterns in their movements.
00:15Every year at the exact same time to the day,
00:18bull sharks on the South African coast migrate around 3,000 miles to warmer waters.
00:24On their return migration, they all stop at one location in southern Mozambique.
00:30This is a secret spot, an offshore reef we call Shark Mountain.
00:36And what's going on? Why are all these sharks stopping at this one reef?
00:39We think they're there to feed.
00:41The real mystery is how they do it.
00:44Growing up to 10 feet, bull sharks hunt warm coastal waters of the world
00:51and are known to mistakenly attack humans,
00:57making them one of the top three most deadly sharks.
01:03They have a reputation for being these mindless, aggressive killers.
01:08But I think they're more sophisticated than that.
01:10And that's what I hope Shark Mountain is going to reveal.
01:14All right, let's do it.
01:23Yeah, you ready?
01:24All right.
01:29The first step in the investigation?
01:31Damn.
01:32To confirm the bulls have arrived.
01:34So is this it?
01:43Yeah, this is it.
01:44This is Shark Mountain.
01:45We've arrived, yeah.
01:46I feel like we're in the middle of nowhere.
01:48Beneath that is the 60-foot-tall fossilized sand dune
01:53that's mysteriously attracting huge numbers of sharks.
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