India's first 7-km-long undersea rail tunnel is set to be constructed in Thane Creek as the National High Speed Rail Corporation Limited (NHSRCL) signed a contract with Afcons Infrastructure Limited, commencing the work process.

"The construction of a 21-km tunnel is one of the most challenging contracts of the Mumbai-Ahmedabad High-Speed Rail corridor. It includes building the country's first twin-track undersea rail tunnel, measuring 7 km, at Thane Creek. Three tunnel boring machines and the new Austrian tunnelling method will be utilised for this tunnel's construction," stated Rajendra Prasad, managing director of NHSRCL.