Under the tumulus a tomb is hidden. Several attempts were made to find it by digging tunnels straight through the tumulus (burial mound). Many have tried, but neither Romans nor modern man have been able to disturb the rest of the dead.
The reason for this, is that the burial chamber probably lies in the massive rock of the mountain itself and not under the loose stones of the tumulus.
According to the inscriptions, one cannot enter the burial chamber without danger:
“The face of a demon has been set as a guard, whom men can neither defy nor free themselves from.”