This unusual combination of cables and cranes is used for wakeboarding I believe. Wakeboarding is a surface water sport which involves riding a wakeboard over the surface of a body of water. (Like water-skiing, but using a rectangular shaped board). Usually pulled by a motor-boat, here on Siblyback Lake on Bodmin Moor there is a closed-course cable system. Sadly no-one was having a go on this day.
Just north of the village of Minions stands Houseman’s Engine House, which houses a permanent exhibition on the history and nature of the surrounding area. Many miners left this area to find a better life in colonies around the world so it is a popular place to visit by their descendants.