Professional free divers are a daring lot. The best of them can hold their breath for over 10 minutes at the surface, and plunge to depths of well over 300 feet on one breath. When they aren’t competing, they dive for fun, sometimes in extreme settings or alongside wildlife. Instagram is speckled with images of divers swimming with humpback and sperm whales, crocodiles and even great white sharks.

More often than not, those are one-off encounters or expeditions. But when Grosmaire is home in Tikehau, where he has lived for five years, he swims with tiger sharks at least once a week.