Cool, thanks for that! I guess its using the same principle as - https://www.lowtechmagazine.com/2020/04/fruit-trenches-cultivating-subtropical-plants-in-freez

Cool, thanks for that! I guess its using the same principle as - https://www.lowtechmagazine.com/2020/04/fruit-trenches-cultivating-subtropical-plants-in-freezing-temperatures.html https://www.lowtechmagazine.com/2020/04/fruit-trenches-culti... Edit: Oh it seems to use underground pipes air is pumped through, neat Will watch the video properly soon.