That's a side quest called grave robbers.
Meet the woman on the cliff, way towards where you first came in. In the center up on the cliff I believe.
This
Orobas Explorers and the Seal thread tells generally where they all are if you want to know.
I'd talk tot he woman first though as she seems to give the most info on it, well that is who I found first at least and she gave the whole story.
