So apparently I have an extra septic tank on my property, that's ventilated and rather large, and was somehow based on an underground wine cellar that a used car lot made in the 1930's. Weird stuff. But, apparently it's large enough that you can actually get down in it and it stopped being used over 20 years ago sometime in the 80's. There's tree roots over the opening so I'll have to cut my way in, so I was wondering, could it be worth it to turn into a mini-bunker, tornado shelter, and storage place, or would I be wasting my time? I'm assuming everything has decomposed and drained by now but I have no idea. Surely there's not 20 year old human waste in there? Guess there's only one way to find out, but it's alot of tree roots to cut.