Varkala Tunnel, situated 41 km from
Thiruvananthapuram city is a century old tunnel under one of the cliffs in
Varkala. It was once used for passing boats carrying goods and people between Thiruvananthapuram and
Kollam. The tunneling work started in 1869 and was completed in 1870. A big hole at the top of the tunnel provides plenty of light and air. Once a civil engineering marvel, now it is not used for commercial purposes. The nearest airport is
Trivandrum International Airport (41 km) and the nearest railway station is
Varkala Railway Station.
