The Mumbai-Ahmedabad bullet train project has reached a major milestone with the opening of the first section of a 21-km undersea tunnel, located between Ghansoli and Shilphata in Maharashtra, an official statement said on Monday.

It said that this tunnel is part of the much-anticipated high-speed rail line connecting Mumbai and Ahmedabad.

The project has already completed 310 km of viaducts, while work continues quickly on building bridges, stations, and laying tracks. Overhead electric wires are also being installed. Progress in Maharashtra has picked up significantly in recent months.