How To Build An Underground 

Hobbit House

That You Can Live In, That Will
Last 100's Of Years
Site Plan and Excavation
You Will Need Equipment- Kubota Loader Backhoe
Steep Hill is excellent place to begin Excavation
Remove dirt well beyond size of the concrete foundation. Space is needed to place concrete (shotcrete) and general access
This site was challenging . Bed rock was encountered that altered the elevation of the foundation and caused the structure to be built as a split level. Good thing makes the interior interesting