This assignment was both physically and technically challenging. My clients, Ritchies, specialise in explosives and rock drilling, and have projects worldwide. In this case, various sections of the Lochy Hydro Electric Aqueduct system, some 5-6 kilometres in length, had to be stabilised using a spray concrete lining. In order to get to many of the sections in question, a walk of nearly 2000 metres, carrying equipment, had to undertaken in complete darkness, not to mention the wet. (Delete intervening sentence and extra full stop!) As these tunnels are aqueducts and usually full of high pressure water there was no power of any sort. The photograph was built up over a period of 5-6 minutes with portable flash and several hand held headlamps using a "painting with light" technique. These tunnel systems will not shut down again for at least another twenty years.