Mumbai 3 On The Cards All About The Proposed Rs 4000-Crore Mega City explores the ambitious Karnala-Sai-Chirner New Town planned across 323.44 sq. km and 124 villages in Raigad. With ₹4,000 crore earmarked for 2026–27 and strategic connectivity through Atal Setu and Navi Mumbai International Airport, Mumbai 3.0 could emerge as a major new hub for housing, technology, logistics, business and infrastructure.