The University of Hong Kong has relocated two salt water service reservoirs (12,000 m³ capacity) of Water Supplies Department (WSD) in rock caverns to accommodate the development of their Centennial Campus. The two rock caverns are 50 m long, 17.6 m wide and 17 m high. This has set an unprecedented local example of constructing service reservoirs in rock caverns. The cavern scheme preserved three historic graded buildings nearby, minimized tree felling and reduced the amount of construction waste generated.