Punalur suspension bridge

The Punalur Suspension Bridge, located in Punalur is the oldest motorable Bridge in Kerala, which was built by the British and is now a historical attraction. The bridge has a length of 400 feet. The suspension bridge was built to prevent wild animals from crossing into the town from the forest area of old Kattupathanapuram.
The bridge is connected to four wells. The iron rods of the bridge is connected to the clips, situated in the wells. Each well is about 100 feet deep and no one since knows the engineering behind the construction of this bridge.
It still remains a mystery!!!