We are proud to announce that the Inter-Terminal Bored Tunnels (ITBT) Project at Changi Airport, Singapore, delivered by the Obayashi–Sato Kogyo Joint Venture for Changi Airport Group (CAG), has received the Silver Award in the Project of the Year (€100–500 Million) category at the ITA Tunnelling Awards 2026 in Lisbon, Portugal.
Undertaken as part of the Changi East Development, ITBT was a remarkable 56-month journey from February 2020 to October 2024. Despite significant challenges, particularly those arising from the COVID-19 pandemic, the project was successfully delivered on schedule through the strong support of CAG and the dedication of the entire project team.
Providing vital baggage and passenger connectivity between the existing Terminal 2 and the future Terminal 5, ITBT includes Singapore’s first large-diameter TBM tunnel, constructed under exceptionally challenging conditions beneath operational airport infrastructure. This accomplishment demonstrates Obayashi’s world-class tunnelling and engineering capabilities.
Established in 2015 by the International Tunnelling and Underground Space Association (ITA-AITES), founded in 1974 and representing 81 Member Nations, the ITA Tunnelling Awards have become the world’s most prestigious international recognitions in the tunnelling industry. Following Obayashi’s Technical Project Innovation of the Year award in 2017, the ITBT Silver Award marks another significant milestone for Obayashi and its first recognition in a Project of the Year category.
Looking ahead, as a sponsor of WTC 2028 Singapore, Obayashi will continue to support the successful delivery of this major global tunnelling event and contribute to the advancement of the international tunnelling community.
