The ragged-tooth shark is the only animal on Earth that is a cannibal before its even born, and its fearsome appearance suggest the "raggie" is a potential man-eater.
In The Ragged Tooth Shark, a very different picture emerges as we follow this incredible shark on its biannual migration along the South African coast.
Here, the raggie population is healthy and stable and the shark is protected. As the animals move north towards their winter breeding grounds, they cross paths with the annual sardine run, taking advantage of this bounty of easy prey to fatten up before the mating season begins.
The shows specialist camera crew ventures into the deep underwater caves at night to film dramatic mating behaviour that has never been observed in the wild before. The crew sets up special lighting in the caves, uncovering an eerie world rarely seen by humans.