Does anyone see how these sit on the ground? I don't see any footings in the video. Just compacted and graded topsoil? What is the floor made out of? See also:

Does anyone see how these sit on the ground? I don't see any footings in the video. Just compacted and graded topsoil? What is the floor made out of? See also: Dante Bini's air formed domes http://openfarmtech.org/wiki/Air-formed_domes http://openfarmtech.org/wiki/Air-formed_domes