The building module for subterranean use 10 comprises a substantially rigid framework 12 and a side wall 20, the side wall being attached to the framework. The side wall includes two substantially parallel layers 22 and an opening for receiving concrete between the panels. Also claimed is a method of installing an underground or subterranean structure by excavating a hole in the ground, placing the building module and pouring concrete into the cavity. Also claimed is a building module for underground use comprising a sidewall, a ceiling 18 and a base. An access opening 19 is provided in the ceiling and a suspended floor covers the base but spaced from the base. A channel is proved from an upper surface for the floor for draining fluid into a void space between the floor and base. The module may be used for pumping apparatus which is noisy and providing sound insulation.
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