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Submerged tree in the Green Lake. The Green Lake or Grüner See is a lake in Austria that dries out almost completely during fall, is used as a county park in the winter and is famous for the underwater park which forms during the spring due to the snow meltdown.

Jacob's Well, just outside of Austin. It is one of the longest underwater caves in Texas and an artesian spring. http://visitwimberley.com/jacobswell/index.shtml

Frozen Bubbles, Abraham Lake, Alberta, Canada. Bubbles trapped and frozen under a thick layer of ice creating a glass type feel to the frozen lake.

Blood Lake found in Texas. This is a product of drought. Red bacteria thrives in the oxygen-depleted water.