The North-East Line Extension C713 project include a 48m C&C tunnel, two-tier box tunnel with the existing parking tunnel open up the connection. The works include traffic turn pouring, the design and construction of temporary retaining structures, soil excavation and support, tunnels and the main structure, and to connect existing water pumps, pipe, fire hose, emergency contact system to the new tunnels and other auxiliary work. The contract value is S$8.16 million.