Delhi Metro Rail Corporation (DMRC)'s 860 tunnel boring laid 612 rings with the inner diameter of 5,8 meters. The tunnel used an EPBM tunnel boring machine.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.tribuneindia.com/news/delhi/underground-tunnel-on-tughlakabad-aerocity-corridor-completed/
Underground tunnel on Tughlakabad-Aerocity corridor completed - The Tribune
www.tribuneindia.comThe Delhi Metro Rail Corporation (DMRC) completed the underground tunnel between Chhatarpur and Chhatarpur Mandir station in Phase 4 of Golden Line on Saturday, officials said.