Dara has a breakthrough hitching a lift on a tug and finally learns to respect the power of the sea. Meanwhile, back on dry land Griff explores Redruth's only working tin mine, and Cornish pride comes to the fore when Rory pays a visit to the place of his birth (now heavily patrolled by police at night). But as the winds pick up and the voyage nears its close, will the boys be able to find a boat willing and able to take them through a force eight gale, the Scilly Isles and their final destination - the spectacular Bishop Rock lighthouse?