In Africa's Okavango Delta, one animal poses a greater danger to humans than any other: the Nile crocodile. Armed with powerful jaws and formidable regenerating teeth, this apex predator inhabits an underwater world that’s never been seen by humans...Until now. In this series of nature videos, one daring team of divers is embarking on the adventure of a lifetime: they’re entering treacherous waters to explore the unknown. Their quest is all about the thrill of discovery – but they must also face unpredictable currents, bad visibility and their own growing fears.