thought about doing the same on my hillside. i figure that if i build a short entryway i can get it at least 10 ft deep underground. my step dad built one with the roof about 3 ft deep on a flat spot but it was too dry to keep potatoes, so they sealed it and made a sleeping quarters for a tornado shelter and storage for home canned food.Made one this past summer love it! Full of potatoes at 50degrees now. 10x12 block, my first time, dug out in the bank shoulder deep with tractor in a hollow, put strong truss roof with metal roofing painted block and roof with the black masoary sealant used 2” thick styrofoam in ceiling for insulation, covered walls up to top of block with dirt, leave floor dirt or with a little gravel for humidity
I don't see the benefit unless you plan on using it to store food short term till it's time to can them.Anyone built one? If so, how is it working for you? Tips? Building description ?