TERRATEC TBM ‘Kolli’ achieves breakthrough at Otteri Station for Chennai Metro Phase-2
TERRATEC TBM S81B “Kolli” achieves its first breakthrough at Otteri Station, advancing Chennai Metro Phase-II Corridor 3. Launched from Ayanavaram Station, it completed 903m of tunnelling, marking a milestone in the 9 km twin-tunnel construction. […]