Defence Minister Rajnath Singh on Saturday inaugurated the advanced Hypersonic Wind Tunnel (HWT) test facility here, making India the third country after the US and Russia to have such a facility. The state-of-the-art HWT Test facility is "pressure vacuum driven enclosed free jet facility having nozzle exit diameter of 1 metre and will simulate Mach No 5 to 12 (Mach represents the multiplication factor to the speed of sound)", a defence release said. After America and Russia, India is the third country to have such a large facility in terms of size and operating capability, it said. It is an indigenous development and an outcome of synergistic partnership with Indian industries.