To find out why sharks are drawn to Hawaii’s volcanoes, biologists Dr. Mike Heithaus and Dr. Frances Farabaugh free dive with one of the most dangerous sharks: the tiger shark.

In Florida, a rare event between top ocean predators was captured on video: bull sharks attacking a great hammerhead. Dr. Heithaus and a team of shark experts launch an investigation…

Discover what happens when two of the deadliest predators face each other.