Delhi Metro Rail Corporation (DMRC) says in statement “As part of the tunnelling drive, two tunnels (for up and down movement) of a length of 1.4km will be bored between Vikaspuri and Krishna Park Extension,”.
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https://www.hindustantimes.com/delhi-news/tunnel-boring-machines-lowered-in-vikaspuri-to-start-tunneling-work-for-metro-phase-4/story-rg2PMe5303rfLUupxFGzLJ.html
DMRC begins boring tunnels at Vikaspuri for Metro Phase-4 corridor
www.hindustantimes.com“As part of the tunnelling drive, two tunnels (for up and down movement) of a length of 1.4km will be bored between Vikaspuri and Krishna Park Extension,” the DMRC said in a statement.