Bengaluru, Aug. 3 -- Plans for Bengaluru's new twin tunnel road, which will link Hebbal's Esteem Mall Junction and Silk Board Junction, will rely on slurry tunnel boring machines (TBMs) to do the heavy digging.

The organization overseeing the project, B-SMILE, opted not to use hard rock TBMs - machines generally preferred when excavating through areas riddled with boulders. Their decision comes after evaluating the city's subsurface, which blends both stones and softer soil, making slurry TBMs a better fit for the job.

BS Prahlad, the project's technical director, shared that lessons from an earlier tunnel build in Mumbai pushed the team toward slurry-based machines this time around, according to The Hindu.

For the twin tunnel project,...