Due to the fact that the second tunnel is still in the early phases of construction, the Brihanmumbai Municipal Corporation (BMC) will only be able to open one side of the Coastal Road route between Marine Lines and Worli in December.

By June 2025, all project-related work, including a promenade and parking garage, is anticipated to be completed.
On May 30, the Mumbai civic authority accomplished a significant milestone by finishing the excavation of a second underground tunnel for the coastal road project at Priyadarshini Park.

According to a BMC press statement, the mammoth project’s second tunnel “breakthrough” was made in front of Maharashtra Chief Minister Eknath Shinde and Deputy Chief Minister Devendra Fadnavis. Work on the project began roughly 13 months ago.
Civic officials claim that while construction of the actual road (which spans more than 10 km) is only 75% complete, the tunnel-digging work between Marine Drive near the Princess Street flyover in south Mumbai and Priyadarshini Park has been completed in full.

Source: mid-day