
Changi Airport Group (CAG) has awarded a S$999 million contract to a joint venture between Japan’s Penta-Ocean Construction and Singapore’s Koh Brothers Building & Civil Engineering Contractor (KBCE) for the construction of underground tunnels at the upcoming Terminal 5 (T5).The tunnel system, expected to take over four years to complete, will facilitate the seamless transfer of passengers and baggage within T5.
It will house key infrastructure including two automated people-mover systems connecting departing passengers to gates and arrivals to immigration halls, an advanced baggage handling system, and a common services tunnel for utilities such as electrical power, communications, and water services.The project also includes a ventilation building and provisions for future underground infrastructure.
Terminal 5, slated to open in the mid-2030s, will be as large as Terminals 1 to 4 combined and designed to handle about 50 million passengers annually.This expansion will increase Changi Airport’s total capacity to 140 million passengers per year, boosting its current capacity of 90 million by over 55%.
The terminal is part of the larger 1,080-hectare Changi East development, which also includes the airport’s third runway and new cargo and transport infrastructure.
CAG’s Managing Director for Changi East, Mr. Ong Chee Chiau, highlighted the importance of this contract award as a key milestone in the construction of T5 and praised the strong track records of both Penta-Ocean and KBCE, who have previously contributed to major Changi Airport projects including land reclamation and ground preparation works.
The new tunnel system will enhance operational efficiency and passenger experience, supporting Changi Airport’s goal to expand its network from over 170 city links to more than 200 by the mid-2030s, in response to the projected doubling of air travel demand in the Asia-Pacific region.