The Pe'ape'a Cave is located deep within the O le Pupu Pu’e National Park, a guide can be organised with the MNRE (Ministery of Natural Resources and Environment) and is highly recommended. The cave can only be explored in the dry season (April to November).
After about an hours walk through the dense jungle there is a dry river bed, a few hundered meters down the river bed brings you to the entrance of the cave where there are dozens of pe'ape'a (little swiflets) flying around the entrance.
Some agile rock climbing brings you down into the immense cave. after about a half hours sprelunking through the pitch black cave you will come to the opening on the other side.
A torch, good footwear and plenty of water are recommended.