About one year and 15 extensions later, the tender to invite contractors to build the proposed twin tunnels under the Sanjay Gandhi National Park (SGNP) has finally got response from six interested companies. If all goes well, civic officials said the BMC aims to start the work next year.

The tunnels — south and north bound — will cost the civic body about Rs 6,225 crore. This tender for the project was floated last year, but was extended 15 times due to a lack of response.