Mumbai: The city’s green lungs, the Sanjay Gandhi National Park, will once again be bored as plans for a third tunnel beneath its expanse move forward. The proposed third tunnel joins two other projects beneath SGNP: the 10.8-km Thane–Borivali twin tunnel, managed by the MMRDA, and the 6.3-km Goregaon–Mulund Link Road twin tunnel, handled by the Brihanmumbai Municipal Corporation. The …