Varkala Tunnel, additionally known Varkala Turuthu, is one of the notable locales of the area. This site was built by the British to set up an inland conduit that was intended to fill in as an exchange course. The development of the long passage was begun around the mid-1860s and took around 14 years to finish. With a length of around 924 feet, the passage assumed a fundamental part in exchanging ship merchandise and individuals from Thiruvananthapuram to Kollam amid the pre-autonomy time.
The passage is situated under the primary precipice of the district and speaks to the compositional perfection of the specialists and architects of that period. Worked under the supervision of T. Mahadeva Rao, the dewan of Travancore, the passage likewise gives path to Varkala's TS waterway, which goes through this fragile structure.