After nearly two years of digging and blasting through bedrock with dynamite, the Metropolitan District boasted a significant construction milestone in the $2 billion Clean Water Project this week — the lowering and construction of a 400-foot-long machine that will dig a 4-mile long tunnel from Hartford to West Hartford. With the boring so far deep underground, people shouldn’t be able to hear or feel the machine as it works its way from Brainard Road in Hartford to Talcott Road in West Hartford.
http://www.courant.com/news/connecticut/hc-news-mdc-south-hartford-conveyance-machine-lowering-20180801-story.html