Bali has launched an ambitious underground rapid transit system to address worsening traffic congestion, with tunnel construction beginning in April 2025 and completion targeted for 2028. The $10.8 billion initial investment will create a 24-hour subway network connecting Ngurah Rai Airport to major tourist destinations including Seminyak, Sanur, and Ubud, featuring 10-minute train intervals. The project prioritises environmental and cultural preservation through underground construction aligned