The tunnel structure in Wan Chai District is constructed under Wan Chai Development Phase II (WDII) .

The construction of the tunnel building in Wan Chai District, i.e. Middle Ventilation Building (MVB) and tunnel cladding works, the installation of tunnel electrical and mechanical works and traffic control and surveillance system, and the testing and commissioning works are undertaken by the Tunnel Buildings, Systems and Fittings, and Works Associated with Tunnel Commissioning Contract (Contract No: HY/2011/08).