FYI (copy/paste)
"The bat cave has existed for about 440-480 million years, and it's lurks quietly in a mangrove swamp in a tributary of Kilim River. The chamber is in the form of a long tunnel. Clinging precariously on the ceiling of hundreds of bats, The stalactites and stalagmites within this cave are of the gigantic proportions. Stalactites on the eastern cave entrance are rather unique as they did not grow vertically downward. The growth of these oblique stalactites is believed to be associated with the deposition of travertine deposits by photosynthetic algae that required brighter sunlight to grow. There are ancient oyster shells attached on certain wall of the cave, a few meters above the sea level, indicating a higher ancient sea level 5000 years ago..."