Canal tunnel

The building of a canal tunnel is crucial to help a waterway that is normally used for shipping cross a difficult section of terrain.

They are also constructed to reduce the dependency on canal locks.

In other cases, especially on English narrow canals, there is no towpath.

The horse would be led over the hill and the boat would be propelled by legging.

Canal tunnels were made in the Kingdom of Travancore as early as 1876.

Shrewley Tunnel
Starvationer at Ellesmere Port Canal Museum with a demonstration of the process of legging to push the boat through the tunnels
The Malpas Tunnel on the Canal du Midi