The Mumbai Metro Rail Corporation Ltd on Wednesday announced that nearly 90 per cent of the tunnelling work on the 33.5 km long fully underground Colaba-SEEPZ Mumbai Metro Line 3 has been completed.

Of the 54.50 km dual tunnel for up and down lines, the MMRCL has till date completed 49.50 km tunnelling, for the city's first fully underground Metro Line 3, a portion of which will go underneath the Mithi River.