As part of the SCL forming the north-south corridor, the SCL – Hung Hom to Admiralty Section [SCL (HUH–ADM)] is an approximately 6-kilometer long extension of the existing East Rail Line (EAL) from Hung Hom Station (HUH) across the Victoria Harbour to the north shore of Hong Kong Island and the Central Business District, providing convenient interchanges at HUH, Exhibition Station (EXH) and Admiralty Station (ADM). This section of SCL alignment will be entirely underground while the associated ventilation building, shafts, plant rooms and station entrances will form aboveground structures.
The preferred alignment for SCL (HUH – ADM) would begin at the north of the new North Ventilation Building, Plant Rooms and Emergency Access (NOV) which is approximately 100m from the southern end of HUH and would cross the harbour at the proposed Hung Hom Landfall. It would then pass through the Causeway Bay Typhoon Shelter (CBTS) before reaching the Hong Kong Island at the proposed South Ventilation Shafts, Plant Rooms and Emergency Access (SOV) situated in the west of CBTS.
On Hong Kong Island, the alignment corridor would run underground along the northern shore through the new EXH, and interchange with the Tsuen Wan Line, Island Line and proposed South Island Line East [SIL(E)] at ADM. As the south terminus station of the SCL, an overrun tunnel would be required at ADM to allow turn back of the train.
To transport the spoil generated from the works areas to the locations for reuse/disposal, two barging points have been proposed at Hung Hom Freight Pier and Wan Chai ex-Public Cargo Working Area to serve for the works areas in Hung Hom and on Hong Kong Island respectively. The one at Hung Hom Freight Pier will be shared to be used for the Kwun Tong Line Extension (KTE), SCL Tai Wai to Hung Hom Section [SCL (TAW – HUH)] and SCL Mong Kok East to Hung Hom Section [SCL (MKK – HUH)].
As the cross harbour section of the alignment would be constructed by the Immersed Tube Tunnel (IMT) method, an IMT casting basin would be established at Shek O Quarry which was previously adopted for the same function for the Lantau Airport Rail project.