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Abstract: The Nant-de-Drance hydropower scheme (900 MW), awarded "Major tunneling project of the year" prize in 2014, connects two existing artificial reservoirs. With the exception of the upper dam heightening, all works are undertaken underground. They include 16 km of tunnels, two vertical shafts of height 440m and 6 caverns. The exceptional size of the powerhouse cavern (194m x 32m x 52m), located at...