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Kallakadal or swell surge waves are coastal flash flood events that take place without any noticeable advance change in local winds or any other apparent signature in the coastal environment. It is derived from a Malayalam word meaning 'thief-like waves'. Kallakkadal events are considered as a growing climatic change risk along the Indian coasts and these are caused by high swell waves, without any sign in the local winds, sometimes cause severe flooding. Other local terms for such events include Rissaga in the Balearic islands.[1]