Power House and its appurtenant works comprise of complex underground openings in the form of two main caverns i.e., machine hall Cavern (222 m x 20 m x 49 m) (Photo 1)and transformer hall cavern (196 m x 18 m x 27.50 m) along with number of tunnels and construction adits. These two underground halls are interconnected by means of an elevator shaft and also six number D-shaped Bus-Duct galleries connect the turbine floor of machine hall with transformer hall . A view of components d/s of Surge shaftis showing Fig.1. Sectional view of Machine Hall is shown in Fig.2.
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