This project involves the reconstruction and backfilling of existing 2.5m wide diameter tunnels running under Queen Elizabeth Drive. The two tunnels are to be filled with sand generated from excavation beneath the exiting lower promenade. Before excavation, CFA piling around the perimeter needs to commence. Approx. 2.5 meter deep excavation will create a storage area, with an on ground slab, block wall perimeter and ultra-floor ceiling.