Steve meets the most colossal shark in our seas. Measuring up to a record 18 metres, the whale shark is not only the largest shark, but the largest fish in the world. Steve dives with this gargantuan shark off the coast of Mozambique in Africa and reveals their somewhat surprising diet, before heading into his shark lab to get under their skin and reveal how they manage to filter their food from the water.

Steve Backshall meets the most sinister shark in our seas. The ragged tooth shark has a mouth that is overflowing with terrifying teeth. But why does it need such gnarly gnashers? Steve heads out on a dive after dark to see these fearsome fangs for himself, before revealing their sinister secret in his shark lab.

Steve comes face to face with the most ravenous shark in the sea - the tiger shark. Known for eating tin cans and even car number plates, there's more to these munchers than meets the eye. Diving with them in the warm waters of the Bahamas, Steve soon discovers they'll use their mouths to investigate potential food. In the shark lab, he reveals how they use clever countershading and camouflage to ambush their prey.