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Cristina Zenato arrived in the Bahamas to do a couple of months of diving - more than 28 years later she's still there, and is now known for her passion for helping sharks. While she's met and helped all kinds, from Hammerheads and Tiger sharks.
Whale Sharks are the gentle giants of the Shark family, stretching 18m or 59 feet, they are filter feeders and inhabit warmer waters. Dr. Mark Meekhan and his colleague Christine Barry have been studying these majestic creatures in the Ningaloo Reef.
Scientists Vic Peddemors and Amy Smoothey study bull shark behavior across marine environments from Lord Howe Island to Sydney Harbour.
An exploration moves from caves in Australia to the Bahamas, where boat captain Neal Watson Jr. guides visitors to Tiger Beach, a shallow submerged quay.
Numerous shark species reside in the Maldives and Fuvahmulah at the southern tip of the island chain contains habitats for thresher sharks hammerheads grey reef sharks and oceanic whitetips.
White sharks inhabit the waters of South Australia and a dive team records the animals near the Neptune Islands where west coast and east coast populations converge.