The Vault project is referred to as the gateway to the Trojena region and includes the creation of an artificial valley and two TBM tunnels to be drilled at a slope of up to 40%.
NEOM is a mega-project being implemeneted in northwestern Saudi Arabia that brings together future technologies and sustainability. This innovative city aims to incorporate many advanced technologies, from digitalization to clean energy, artificial intelligence to environmental protection. Spanning a total area of 26,500 square kilometers, NEOM comprises the Line, Oxagon, Trojena, and Magna sub-projects.
The main components of the project include the TTT North Tunnel (TBM-1) with a length of 3,622 meters, the TTT South Tunnel (TBM-2) with a length of 3,628 meters, and the TTT NATM tunnels with a total length of 1,036 meters. The project scope also includes two sequential ventilation tunnels with a total length of 137 meters, four front shunt tunnels with a total length of 25 meters, two mined switch tunnels with a total length of 185 meters, an 81-meter cavern tunnel, a 15-meter hammerhead gallery, and 16 cross passages with a total length of 196 meters, as well as vault excavation works and vault NATM tunnels with a total length of 978 meters.
As of 2025, 7 million cubic meters of the planned 8.88 million cubic meters of vault excavation has been completed. Within the scope of excavation support works, 635,000 meters of the planned 810,000 meters of anchoring have been installed. In addition, 1,183 meters of the total 1,796-meter rockfall barrier, designed to prevent rockfalls, has been completed.
Within the vault tunnel works, excavation and construction of the D17 and B1 tunnels have been completed. The explosives storage facility has also been constructed and delivered to the client. The segment factory has been installed and production has started. Out of the 4,833 segment rings planned to be produced in total, 1,517 were manufactured in 2025.
The installation of TBM-1 for the TTT North Tunnel has been completed and excavation works have commenced. As of the end of 2025, 332 meters of progress has been achieved in the TBM-1 excavation. The installation of TBM-2 for the TTT South Tunnel has also been completed, the required permits have been obtained, and excavation works are planned to start in 2026.
Excavation and construction works for the ventilation, connection, cavern and cross passage tunnels within the TTT NATM tunnels are ongoing. In addition, 174 meters of the total 383-meter rockfall barrier planned within the scope of the TTT project has been completed.