Day 2 - Natural Bridge Caverns

 

12/26/25 - Natural Bridge Caverns - San Antonio, TX

Started the morning with 2 different tours of two caves on the property! Was here about 10 years ago and they finally opened up a new cave since I was last here. Discovered by drilling bore holes... they knew another cave was here but had to find it. 5 holes drilled 2 were successful. Very well formed cave. Nice!

Then when done, off to Houston for the NASA tours tomorrow!

Click on any photo to see an enlarged version.

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Had a double tour today of Natural Bridge Caverns. The Natural Bridge is about collapsed into nothing! Tour 1 was their newest cave - Found by drilling. This is the way they got into it!
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Fortunately they now had easy walkways into the cave. This cave is a closed climate and it is still growing and active. Closed climate means like airlocks to prevent the climate from coming in. NO bats, no wildlife (maybe a cricket or two)
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Another Borehole - sealed at the surface. Some very long Soda Straws!! 4 1/2 feet long! Left the new cave system and took the old tour. Here is the way the first people went in. No thank you!!
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Both caves were 80 degrees with 98% humidity! You were sweating halfway though the tour! But the high humidity is what is needed to keep these formations alive and growing. Though they only grow one cubic inch per 100 years... don't break one!! $15 to 30 thousand fine!!
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A very large Collumn!! Basically 5 stories high! Called The Watchtower Climbing back out toward the exit. Steep and I was definately panting (and did I say Sweating!!)
 

Click on any photo to see an enlarged version.

Movies of the new cave formations & rooms
Movie 1 - 27 Meg Movie 2 - 52 Meg Movie 3 - 15 Meg

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Last updated: 12/30/25