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The Teflon-coated roof, designed by the German structural engineering and consulting firm Schlaich Bergermann &amp; Partner, was built at a cost of US$48 million (₹308 crores). Taiyo Membrane Corporation supplied and installed the PTFE glass fibre fabric roof. It is the one of the largest membrane roof system in the world. 8,500 tonnes of steel were used in the construction of the stadium's roof and its support structure. The support structure for the new roof is similar to London's Olympic Stadium. In case of emergency, the construction allows for all 60,000 spectators to be safely evacuated within 6 minutes.