Connecting tunnels between the Eastern and Western Expressways

Key facts

Underground road infrastructure comprising two twin tunnels, each 5.3 km long (10.665 km excavated).

Internal diameter of 13 m, with three lanes in each direction, a pedestrian walkway and integrated utility ducts.

Excavation mainly in basalt rock, with cover ranging from 20 to 160 m.

Tunnel portals at different elevations: 51 m above sea level at Goregaon and 33 m above sea level at Mulund.

Construction using two new TBMs and final lining with prefabricated reinforced concrete segments.

Connecting galleries every 300 m for safety and evacuation; design speed 80 km/h.

Associated works: 1.23 km of access roads and 1.44 km of additional box tunnels.

Total length: 13.335 km.