An investor has been secured by the provincial government of Bali, Indonesia for a US $20bn subway project. The new system of trains is meant to reduce congestion on existing road infrastructure.

The infrastructure development’s project manager PT Sarana Bali Dwipa Jaya (SBDJ) notes that construction is expected to start in September. The scheme will run through four phases and introduce an underground rail network between Bali’s I Gusti Ngurah Rai International airport and the country’s popular tourist destinations.

Work will include construction of transportation infrastructure, including tunnels and subway tracks, and utility infrastructure for telecommunications, water, electric and waste, according to a report.

SBDJ President Director Ari Ashkara, via a government statement, said a groundbreaking was expected in September.

Phases one and two, which will run new lines from Ngurah Rai airport to Cemagi and from the airport to Nusa Dua, respectively, are projected to finish in 2031 and cost $10.8bn. The entirety of the second phase and a portion of phase one should finished in 2028, Ashkara remarked.