Jo Brand's Big Splash

Jo attempts synchronised diving and invites Sean Lock to join her in a very muddy race.

Jo asks Bill Bailey to help her assess the trendy new craze of wild swimming, and also tackles the Olympic white water canoe slalom course.

Jo meets a man who can hold his breath underwater for a staggering 20 minutes, and Rich Hall tries a traditional canal holiday.

Jo meets the RNLI as they train for a maritime emergency and joins Meera Syal in a raft race.