Everything2

Everything2 has a fun and funny article up concerning underground housing. The author is by no means an expert, but more akin to myself, someone very interested in building underground, who has done their homework on the subject. From the article:

"Earth houses are extremely awesome. The earth is 100% soundproof. Sheer novelty will keep visitors in awe and thinking that the owner must be some kind of deity. In case of attack by hordes of Mongolians, underground houses are defensible, they slighly resist fire (they take it better than a normal house, anyway), and can include hidden escape tunnels. The roof of an earth house can be planted on- the only space that can't be used twice is the face, and that doesn't apply to Envelopes which can use the courtyard."