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| The walls are a very soft sandstone, and the frequent large piles of fallen-down cave material we encountered made us rather worried about the possibility of a collapse. | 
 
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We tried not to make any loud noises or bump the ceiling. | 
 
 
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There is some painted graffiti, but most of the vandalism is actually carved right into the walls. They're really so soft you can make quite a scratch with just your finger. | 
   
  
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I imagine it leads to another part of the cave system, perhaps the bit behind the auto salvage yard. | 
 
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The caves stretch for quite a ways along the river bank, going all the way back to about the old staircase/fire tower in South St. Paul. |  
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| In places the caverns rise quite dramatically, and there are some surprisingly large open spaces inside. |  
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| In one hallway was a rusted work table, with Grand Marnier bottles scattered all around it. That's expensive stuff! | 
 
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| Portions of the tunnel were apparently at one time electrified. |  
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