The celebrities fend off circling reef sharks without the safety of a cage, Helen faces her fear of the sea, and Ade has an equipment failure while surrounded by sharks

The celebrities are cast out to sea, Lucy has a moving encounter with the endangered great hammerhead shark, and Lenny opens up to Ade about his motives for being here.

Dougie has a shocking shark encounter in a shipwreck a week before the tiger shark dive, and there is a storm at sea while the team are diving with Caribbean reef sharks.