What is the deepest point in Mammoth Cave?
The cave was explored in the 1960s but never surpassed the 1,444 ft (440 m) mark, until the late 2000s. In 2010, the deepest point was 5,610 ft (1,710 meters). In 2012 the explorations passed the 6,562 ft (2,000 m) mark, making it the first cave deeper than 2 km.
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