The challenging tunnel under the National park will be "tackled later". It will be construction via TBM method.
https://timesofindia.indiatimes.com/city/mumbai/mumbai-bmc-to-table-rs-700cr-plan-for-gmlr-bridges-next-week/articleshow/88348658.cms
Mumbai: The work on BMC’s ambitious Goregaon Mulund Link Road (GMLR) is slated to begin soon.
https://timesofindia.indiatimes.com/city/mumbai/mumbai-bmc-to-table-rs-700cr-plan-for-gmlr-bridges-next-week/articleshow/88348658.cms
Mumbai: BMC to table Rs 700cr plan for GMLR bridges next week | Mumbai News - Times of India
timesofindia.indiatimes.comMumbai: The work on BMC’s ambitious Goregaon Mulund Link Road (GMLR) is slated to begin soon.