As much as seven Indian companies have shown interest for the construction of the undersea tunnel for the ambitious Mumbai-Ahmedabad High-Speed Rail (MAHSR) corridor during the pre-bidding stage, officials said on Sunday. 

A National High-Speed Rail Corporation Limited (NHSRCL) official told IANS, "Seven Indian companies had participated in pre-bid meeting for constructing the undersea tunnel of the corridor."
The official stated that the tender for the construction of the tunnel has been floated and bids are invited till February 19, 2021.

 The bullet train project will have a 21 km long underground corridor from BKC to Kalyan Shilphata in the state of Maharashtra.

The official said that around 7 km of this underground corridor is under the Thane creek. Of this, 1.8 km long section will be developed under the sea bed, while the remaining part of the stretch is to be built under the mangroves marshland on either side of the creek.  The official said that tender is for the development of tunnel, which includes testing as well as commissioning for the double-line high-speed railway for the project using tunnel boring machine (TBM) and a new Austrian tunnelling method (NATM).

A geotechnical investigation of the undersea tunnel area was carried out earlier by a team of engineers from NHSRCL, RITES and Japan's Kawasaki Geological Engineering firm.

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