It is about aerial photos of ash storage lagoons of the largest oil shale power plants in the world, the Narva Power Plants in eastern Estonia, located directly to the NATO external border with Russia.
I had already planned to photograph these special lagoons for a number of years, as I am visiting Estonia every year (my wife is Estonian) - But it was difficult to get a flight permission because the place is so close to the NATO - Outer border.
The oil shale burnt at Narva plants produces roughly 46% ash, so the stations produce about 4.5 million tons of ash per year. The ash-disposal system involves washing it away with water, and the dirty water is stored in ash-storage lagoons which appear bright blue seem from above.
