How Many Tunnels in Hong Kong? 121 as of 2023

As of 2023, Hong Kong has 121 tunnels total, comprising:

• Vehicular tunnels: 16 (including 3 cross-harbor: Cross-Harbour, Eastern Harbour, Western Harbour)
• Rail tunnels: MTR network (multiple lines, both heavy rail and Airport Express)
• Pedestrian tunnels: Numerous subways under major roads
• Utility / service tunnels: Drainage, cable, maintenance

The count includes all gazetted tunnels under the Buildings Ordinance. Major projects like the Tuen Mun–Chek Lap Kok Link (5 km, opened 2020) and Central–Wan Chai Bypass (3.7 km, 2019) added recent mileage.

Hong Kong's topography (steep hills, harbor) makes tunneling essential for transport.