The Dartford Cable Tunnel is a 2.4 km utility tunnel beneath the Thames, upstream of the Dartford Crossing. With a diameter of ~, it carries a 400 kV National Grid electrical transmission cable. It is accessible by foot as a crossing of the Thames, but by authorised personnel only. It was built in 2003–04 at a cost of £11 million (equivalent to £ million in ). The tunnel plays a crucial role in maintaining electrical supply infrastructure beneath the Thames, ensuring reliable power transmission.
See also
- 400 kV Thames Crossing
- Thames Cable Tunnel
- Utility vault
- Crossings of the River Thames
- Tunnels underneath the River Thames