The sight of a lake at the bottom of the ocean is simply amazing! This is a brine pool, an underwater lake, or bodies of water that have a salinity three to five times greater than the surrounding ocean.
In 1990, half a mile down in the Gulf of Mexico there is an underwater lake that is twenty meters long with its own tide. The soup of the lake is a salty brine of heavy salt water, heavier than the surrounding water. Here a methane seep helps to create its own biological environment where strange muscles, tube worms, squat crabs and other life forms free of the ecosystem that supports other oceanic life thrive on poisonous methane.