Open research question
Is there independently verifiable geological, archaeological, or geophysical evidence for an artificial underground tunnel network beneath the ridge, rather than natural cavities or sedimentary formations?
A source, research note, or further-reading link closes this question when staff accept it. Evidence and corrections stay attached for staff and do not close it by themselves.
Staff review every contribution before it is added to the file. A correction is a proposal: accepting it does not replace the official record. Rejected items are handled like rejected case submissions.