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One could buy a railway ticket from Chennai to Colombo, whereby people travelled by rail from Chennai to Pamban island, go by ferry to Talaimannar, and then go again by rail to Colombo.In 1964, a cyclone completely destroyed Dhanushkodi, as a train was about to enter the station.It was reportedly passable on foot up to the 15th century until storms deepened the channel: temple records seem to say that Adam's Bridge was completely above sea level until it broke in a cyclone in 1480.The sea separating India and Sri Lanka is called Sethusamudram meaning "Sea of the Bridge".
Various organizations have opposed the project based on religious, economic and environmental grounds and have sought the implementation of one of the alternative alignments considered during the earlier stages of the discussion.
Radiocarbon dating of samples in this study suggests the domain between Rameswaram and Talaimannar may have been exposed sometime between 7,000 and 18,000 years ago.
In the same study, carbon dating of some ancient beaches between Thiruthuraipoondi and Kodiyakarai shows the Thiruthuraipoondi beach dates back to 6,000 years and Kodiyakarai around 1,100 years ago.
is a chain of limestone shoals, between Pamban Island, also known as Rameswaram Island, off the south-eastern coast of Tamil Nadu, India, and Mannar Island, off the north-western coast of Sri Lanka.
Geological evidence suggests that this bridge is a former land connection between India and Sri Lanka.
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Another theory affirms that the origin and linearity of Adam's Bridge might be due to the old shoreline (implying that the two landmasses of India and Sri Lanka were once connected)from which shoreline coral reefs developed.