The Mumbai Trans Harbour Link, also known as the Sewri–Nhava Sheva Trans Harbour Link, is an under-construction 21.8 km (13.5 mi) 6-lane access-controlled expressway grade road bridge, which will connect Mumbai with Navi Mumbai, its satellite city. When completed, it would be the longest sea bridge in India. The bridge will begin in Sewri, South Mumbai, will cross Thane Creek north of Elephanta Island, and will terminate at Chirle near Nhava Sheva. The road will be linked to the Mumbai–Pune Expressway in the east and to the under-construction Coastal Road in the west. The 6-lane highway will be 27 meters in width, in addition to two emergency exit lanes, edge strip, and a crash barrier. The project is estimated to cost a total of . The Mumbai Metropolitan Region Development Authority (MMRDA) awarded contracts for the project in November 2017, construction began in April 2018, and was scheduled to complete within 4.5 years. Construction was delayed by around 8 months due to the COVID-19 pandemic, and is currently expected to complete by December 2023. The MMRDA estimates that 70,000 vehicles will use the bridge daily after it opens. History Transportation and traffic planning for Greater Bombay was commissioned for Wilbur Smith and Associates in mid 1962. The firm's report, based on extensive studies conducted over 18 months, was handed over to the Union Ministry of Transport on 19 December 1963. Among other projects, the report proposed the construction of a sea link, known as the Uran Bridge, to connect Mumbai with the mainland near the town of Uran. However, Smith was unsure of the link's feasibility. Citing poor traffic expectations in Uran even in 1981, his report advised a more detailed study of this connection and recommended waiting until "the Trans-Thana area develops further and more community services are extended to Uran." In 1973, the Vashi Bridge linking Mankhurd in Mumbai with Vashi in Navi Mumbai was opened. First attempt The first concrete attempt to build the sea link was made in 2004, when Infrastructure Leasing & Financial Services (IL&FS) submitted a proposal to implement the project on a build, own, operate, and transfer (BOOT) basis. The Maharashtra State Road Development Corporation (MSRDC) also submitted a counter proposal. However, the IL&FS proposal was side-lined by the government, for undisclosed reasons. Second attempt Another attempt was made in 2005, when the MSRDC invited bids for the project. The bids submitted by