Although M. Night Shyamalan uses the motif of water to convey weakness of a character, and his character tells Rev. Hess that he's planning to go to the lake, because "it is known that they don't like water...", it's also a nod to other films in the sci-fi genre: the classic 1963 "The Day of the Triffids", in which carnivorous aliens feed on humans - and having been hit unsuccessfully with fire, chemical and other weapons - are finally vanquished by the simplest of elements - seawater! And, the more recent 1988 "Alien Nation", in which seawater behaves as an acid on the aliens' flesh and dissolves them, painfully. Or, as some would say, they were "liquidated".

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