Chennai Metro Rail Limited's Phase II milestone with tunnel boring machine Kalvarayan completing an underground stretch
https://www.constructionworld.in/transport-infrastructure/metro-rail-and-railways-infrastructure/chennai-metro-tbm-completes-key-tunnel-link-below-rail-tracks/73840
Kalvarayan completes 867m drive from Ayanavaram to Perambur.
https://www.constructionworld.in/transport-infrastructure/metro-rail-and-railways-infrastructure/chennai-metro-tbm-completes-key-tunnel-link-below-rail-tracks/73840
Chennai Metro TBM Completes Key Tunnel Link Below Rail Tracks
www.constructionworld.inKalvarayan completes 867m drive from Ayanavaram to Perambur.