I was thinking underground as well, but don't forget about the waste storage area/infrastructure: https://news.ycombinator.com/item?id=40540802 https://news.yc

I was thinking underground as well, but don't forget about the waste storage area/infrastructure: https://news.ycombinator.com/item?id=40540802 https://news.ycombinator.com/item?id=40540802