I'm considering making an outdoor root cellar primarily for storing potatoes. Potatoes don't cost much, so the only way it's going to happen is if I can do it on the cheap. I've heard of people burying new concrete septic tanks that were damaged in curing or transport, but I just can't figure out a cheap way to do that. I've also heard about using large culverts, but I have my doubts about finding those cheap.
My dad has a mini-excavator and I have a loader on my JD 2950 (tractor related post now). I do not want to hire any work done.
Has anyone done something similar? Any other ideas?