Greg James, Jack Dee, Dara Ó Briain, Mel C, Chelsee Healey, and Phillips Idowu return from their terrifying five-day whitewater canoe expedition down the Zambezi River for Comic Relief's Hell and High Water challenge. In this hilarious debrief, they reveal their scariest moments—hippos, crocodiles, near-drownings—and celebrate raising an incredible £1,196,000 to build a school in Zambia.