The world's deepest flooded cave, known as the Hranice Abyss in the eastern Czech Republic, may be up to a kilometer deep -- more than twice the previously estimated depth, according to a study that used geophysical imaging techniques to map the cave. Researchers also suggest the cave was formed by a top-down process -- in which water drains down, dissolves rock and creates a cavity -- instead of a bottom-up process.
Researchers: Deepest flooded cave deeper than thought
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