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So apparently there are lakes of super-saline water at the bottom of the ocean.
"During the Jurassic period the waters here were shallow and became cut off from the ocean. The area soon dried out, leaving a thick layer of salt and other minerals up to 8km thick. When ocean water returned after the region rifted apart, the super-saline layer at the bottom of the Gulf became an underwater lake. Now brine, which is continually released from a rift in the ocean floor, feeds the lake."
Sources:
http://www.geekologie.com/2008/09/wait_what_an_underwater_lake.php and
http://www.environmentalgraffiti.com/featured/lakes650ft-beneath-the-waves/2413 Sorry if this is a repost...it's new to me.