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Pictured below: R.V. and B.R. after completing exploration and survey of Arch Cave in St. Louis, Missouri.
Final survey of the cave resulted in the discovery of a second entrance at the end of a large borehole passage.
The cave has open access throughout the year, though there is a restriction on through-trips in aircraft.
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See the map
Seriously, you can get more information on the Gateway Arch in St. Louis here:
