During the tunnelling of Mumbai Metro line 7A at P&T Colony in Sahar, an underground cavity and weak local soil strata were encountered unexpectedly, said an official of the Mumbai Metropolitan Regional Development Authority. These conditions were not identified or analysed prior to the tunnelling activities. Upon discovering this issue, tunnelling operations using Tunnel Boring Machines (TBM) were immediately halted, and the subsided soil portion was addressed through grouting and concreting.

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As a safety measure, residents of nearby buildings were promptly relocated to hotel rooms in the vicinity of the colony, officials added. Following the completion of the concreting process, tunnelling will resume only after ensuring the stability of the soil and the effectiveness of the cement grouting in the area. It is important to highlight that no individuals or property were harmed during this incident, and every precaution is being taken to prevent any further cave-ins, the official stated further.

Mumbai Metro 7a’s Andheri East-CSIA T2 stretch is a 3.17-km-long corridor, of which 2.95 km is underground, and the remaining is elevated. This is an extension of the Metro 7 (Andheri-Dahisar), to connect the airport with the metro line.