The Varkala Tunnel is a 924 feet long tunnel. This tunnel was constructed in 1867 by the then Deewan of Travancore, T. Mahadeva Rao. The construction of the tunnel took 14 years for completion. It is a popular tourist stop. It was constructed for the Attingal Palace. The intention of making the Varkala Tunnel was to have an inland waterway. The structure of the tunnel attracts tourists as it is the symbol of ancient engineering excellence. Have a look at it when you visit Varkala and marvel at the genius of the past generation. The Varkala Tunnel lies in the vicinity of the Varkala Light House.