Omg, I can't believe no one has quoted Cheech and Chong baby! They had a huge grow op "underneath" a pool. For an eye in the sky, they'd be looking for stuff out of the ordinary. What is pretty normal for a pool? A pool cover. If you hear choppers overhead I'd put that shit on right quick. When they fly over it just likes some dude with a cover on his pool. I doubt they'd be interested enough to give it further inspection, haha.