I've been in those caves during the 2001 summer season. Both the well known 'touristy' ones and some lesser known one on the Eastern side of the
island.
It was noted by Rutledge in 1914 that these caves needed a complete and full investigation but to date it hasn't been completed to the level needed
Easter Island will remain as a secret because their natives are very distrustful with everyone that's not from the island, even with another
chileans (they don't feel chilean even when they are part of our country). They want to keep the secrets of the island remain secret, and some stuff
will never be known.
I'd say the destruction of the culture was nearly complete. My own experience is that most Rapa Nui know less about their own ancient culture than
the out siders who studied its remnants. They are however knowledgeable of the post collapse society. They lost their priest hood, elders and matrons
in the quano raiders, Gambler island deportation and small pox disasters.
Oh one correction the name should be Routledge not Rutledge.