Hoy, Lyness, Wee Fea, Underground Fuel Reservoir

1938-1943. Extensive network of 6 rectangular underground fuel storage reservoir tanks with operational and maintenance access tunnels, valve chambers carved out of the hillside bedrock and predominantly lined in shuttered concrete. At the head of the operational piping tunnel is a small square-plan fan room, and at the end are 6 underground fuel tanks. The tunnel is approximately 350 metres long by 3 metres wide. The tunnel has two pipes laid underneath the concrete floor and accessed by metal inspection covers, connecting each underground tank to the tank farm in Lyness. The tanks, each with valve chamber to control the flow of oil, are of variable dimensions due to the geology of Wee Fea however they are an average of 9 metres wide by 237 metres long and 13.5 metres high, with a capacity of approximately 5.6 million gallons of fuel.