The remaining space is taken up by technical transmission systems (computer, electricity, air condition, heating and water) and also by 18, 3 m3 of soil, the bed for eight Ficus Panda trees.

There could be special catalysts in the soil, for example, perhaps created by the static electricity whipped up by dust devils.

Study on the engineering geology property of the rock-mass and soil-body is always the keystone in the water and electricity field.