The word Walipini, derived from the Aymaran language and an indigenous Bolivian tribe, is translated as “a place of warmth” and is an earth sheltered cold frame or transparent-roofed enclosure. This underground greenhouse was created for the cold regions of South America to maintain food production year round, but is now being adopted by gardeners
How To Build an Underground Greenhouse — Growing your own food isn't difficult in the summer, but winter gardening is a lot more complicated. It is made infinitely easier when you have a space that is insulated from the elements.
How To Build an Earth-Sheltered Greenhouse - Natural Health