England

Cornwall

• Saltash Tunnel[?] connecting the Tamar Bridge to the A38[?] and vice-versa.

Essex/Kent

• Dartford Tunnel[?]

Gloucestershire

• Severn Tunnel

London

• The London Underground includes 171km of tunnels, with some Northern Line trains running continuously in tunnel for 27.8km between Morden and East Finchley via Bank.

Merseyside

• Queensway Tunnel, Mersey
• Kingsway Tunnel, Mersey

South Yorkshire

• Totley Tunnel[?] in Sheffield is approximately 6km long and was completed in 1893. Connects Totley[?] to Grindleford[?] and is one of the longest railway tunnels in the UK after the Severn Tunnel and the Chunnel.

Tyne and Wear

• Tyne Tunnel, River Tyne

Wiltshire

• Box Tunnel

Wales

• Severn Tunnel