Deep Rock Tunnel Connector Indianapolis, Indiana From October 2012 to June 2013, Case installed drop, vent and utility shafts at 6 unique site locations for the Indianapolis Deep Rock Tunnel Connector. Case installed a total of 3 drop shafts, 3 vent shafts and 3 utility shafts up to 14.5ft diameter and 120ft of overburden excavation under bentonite slurry support. Once shafts were excavated to the top of rock, a piece of full length perma

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