India's first Mumbai-Ahmedabad bullet train to give travellers undersea experience, but building it no easy feat
The undersea tunnel can be built only during high tides, limiting the working period to just 4-5 hours.
Dec 20, 2017, 07:29 AM IST
The undersea tunnel can be built only during high tides, limiting the working period to just 4-5 hours.
Dec 20, 2017, 07:29 AM IST