Watch our archive footage from the first ever Great Motorboat Tour
Twenty first leg: leaving Portrush
John, Fionn and their third crewmember, Eddie, refuel and stock up on supplies in Portrush before deciding to make the most of the weather by heading towards Burtonport.
However, with conditions worsening throughout the day, all does not go to plan so they decide to take shelter for the night in Sheephaven Bay, Donegal.
Will they reach Burtonport, and if so, what will they make of the entrance when they get there?