அமெரிக்காவில் அதிசய குகை | பூமிக்கு அடியில் ஓடும் ஆறு | Natural Bridge Caverns in America | way2go

Natural Bridge Caverns:
The Natural Bridge Caverns are the largest known commercial caverns in the U.S. state of Texas. The caverns are located near the city of San Antonio, Texas, united States Of America.The caverns feature several unique speleothems and other geological formations. The temperature inside the cave is 21 degrees Celsius (70°F) year-round and the humidity rate is a constant 99 percent. The deepest part of the public tour is 180 feet below the surface, although undeveloped areas of the cavern reach depths of 230 feet. The caverns were discovered on March 27, 1960, by students Orion Knox Jr., Preston Knodell Jr., Al Brandt and Joe Cantu from St. Mary's University in nearby San Antonio

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