The work of Cayman's shark taggers is the subject of a new documentary, 'Tagged & Tracked', that premiered this week.

(WANE) – Two new sharks joined two longtime sharks the tank inside the Australian aquarium at the Fort Wayne Zoo. There are two Black Tip Reef sharks, a Zebra shark and a Tasselled Wobbegong.

Here, in Tikehau, French Polynesia, looking out his thatch house, shark swimmer and free diver Denis Grosmaire watches over migrating whales and, by his estimation, 30 black-tipped sharks.