All of the young ones had one thing in common, they were taken in by small communities of the fey. Some say their parents died of unfortunate accidents, others would say these accidents were too suspicious and coincidental to be happenstance.
Nevertheless, elevators would descend to the underground and young adults that left had no memory of anything but the happy community of small fey creatures that raised them. Pushed them to be their best, and then waking up at the bottom of the shaft.