This video shows remote-controlled miniature diggers being used to escavate basement. It's taken quite a while, according to one source, though it seems more like a growing hobby than an explicit construction project.
You'll be struck by how incredible the "toys" are. Find out more at rctruckandconstruction.com.
On our forum you will find many gifted builders of both trucks and construction equip of all levels of skill and everyone is friendly, outgoing & enjoys helping out newcomers wanting to get involved with the hobby. There's a Vendor's Section of private hobbyists who are willing to put up their skills for hire at a fee that is driven moreso to help others in the hobby, rather than lining their pockets for maxium profit..don't get me wrong, they don't give away their time, but they are priced very reasonably and the quality of their work is carefully monitored by myself & others who are leaders of the forum.
The detailed perfection of the custom-built mini-diggers makes screenshots and some of the videos disorienting, as if we had discovered and begun unearthing vast mysterious monuments that perfectly resembled dingy basements.