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There are two entrances to the caves and we tried both of them out after the first one took us on an almost vertical descent. The BLM claims you don't need ropes and harnesses but I beg to differ. We decided to turn around after about an hour. Our second entrance included a bat, some rats, and required a very long crab walk and belly shimmy. The inside was cool and damp about 75 degrees compared to the 105 temp outside. I thought I'd have trouble being in such tight quarters but I was surprisingly comfortable. Another bonus - we were there mid day on a saturday and we didn't see another soul.
The Bloomington Caves span a distance of 1.3 miles and drop 240 feet and a permit is required. The caves are not for small children. I'm sure we'll be going again so let us know if you want to come along.