Just been there over the weekend and must say was a mesmerizing experience.
Went with the family and everyone thoroughly enjoyed the adventure. It is 1 hr boat ride from srisailam and the Aptdc takes 270 per head and you need to wait until they reach the 20 headcount.
The trip takes around 3-4 hrs. On reaching the caves; there is an idol of Akkamahadevi at the entrance and you need to walk a considerable distance inside the dark caves to reach the lingam.
The caves as per the geoglists are millions of years old. Its better to go in a group as if you take 1 wrong turn can easily get lost in the caves. Although i did not a way where one can get lost, but proabably we were in a group of 20 ppl. While entering keep in mind to have your eyes down on the ground as the way is not smooth. Carrying a torch is a good idea. And remember dont point the torch light at the roof as there are several bats which might frighten you.
Overall, the experience is worth going there.
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