A few years ago when the late Brian Webb and I were working on our Middleton Flats project I built a housing from scrap wood and aluminium angle which we used to drop my compact camera down shafts. We had faffed about dropping a couple of shafts only to find that they went nowhere so we used the camera to save unnecessary work. Basically it was a rectangular box open at one end, with a sliding lid and a plastic tube underneath containing a Fenix torch. There were wooden slots at the open end into which the camera fitted. You opened the sliding lid, slotted in the camera and switched it on in video mode, closed the lid, turned on the torch and lowered it down the shaft. You pulled it back up and, hey presto, you had a film of the shaft. Cheap and cheerful but it worked and as, like most people, I already had a small camera the cost was nil.