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Continue to ChatNiagara Tunnel - Crappy rock, Horizontal stress, SLOOOOOW progress https://geoprac.net/2009/04/niagara-tunnel-crappy-rock-horizontal-stress-slooooow-progress/
Niagara Tunnel - Crappy rock, Horizontal stress, SLOOOOOW progress https://geoprac.net/2009/04/niagara-tunnel-crappy-rock-horizontal-stress-slooooow-progress/