With Mumbai Metro Rail Corporation (MMRC) last week achieving 34th breakthrough of the 648-m long tunnel from Churchgate to Hutatma Chowk station, the total tunnelling of Mumbai's first underground Metro rail project is completed 89 per cent and civil work is at 61 per cent.

Robbins-made dual mode hard rock Tunnel Boring Machine (TBM) Surya-1 has completed the upline stretch in 292 days using 506 rings.