Sir Lenny Henry, Lucy Punch, Helen George, Rachel Riley, Ade Adepitan, Dougie Poynter and Ross Noble embark on a dangerous journey to the Bahamas to swim with sharks.

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.