With the detailed project report completed and land acquisition started, the work on building India's longest (11.80 km) road tunnel linking Thane-Borivli - passing beneath the Sanjay Gandhi National Park (SGNP) - will start from March 2022, Maharashtra PWD Minister Eknath Gaikwad said on Thursday.

The Maharashtra State Road Development Corporation (MSRDC) project, which will comprise a 10.25 km double tunnel and 1.55 km junction, is slated to cost around Rs 11,235 crore and expected to be completed in about 66 months.