“There were some issues related to collapse of the earth over the machines [tunnel boring machines]. Now the problem is solved. Whatever the technological involvements were there have been sorted out,”
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.thehindu.com/news/cities/kolkata/issues-of-ground-subsidence-at-east-west-metro-in-kolkatas-bowbazar-resolved-says-official/article66744746.ece
Issues of ground subsidence at East West Metro in Kolkata’s Bowbazar resolved, says official
www.thehindu.comIssues related to ground subsidence during the ongoing tunnelling of East West Metro project in Kolkata’s Bowbazar stretch has been resolved