Interesting what a drone can spot

3 weeks ago I was photographing in a slate quarry and got the first image of the “copper sulphate” filled pit, with water gushing into it from the quarry above.
Last week I flew the drone over the same spot and was confused when I couldn’t find the “Pond” - Photo 2 - seems it regularly drains out, revealing an old quarryman’s hut and the remains of trees that once grew there. What gave it away was the hut in the top left of photo 2 - its exactly what I leant against to get photo 1.
Im glad I have now sorted that out as I don’t like being confused !!! lol