Remember that hole http://smellavision2.blogspot.com/2005/09/going-further-underground.html here's whats happening to it. The walls are being cast in concrete, the steel bars are formed, like the base slab, into two layers, tied together and spaced apart from the front to the back, next a board is raised to form the front of the wall, this is known as formwork, or shuttering, and is usually treated with a release agent, so that when the concrete is cast behind the formwork, when it sets the board can be reales without it sticking to the concrete.
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