He found the fuse cords quickly, marked by the stone mound he had made earlier, and struck a match.
It stands on a low stone mound or cairn with a diameter of around 10 metres.
A stone mound in the southeastern part of the city has recently been the subject of controversy.
Soil removal was underway from the hill near the stone mound, when controversy began as to whether the site might be destroyed.
The discovery of a stone mound, said to resemble an altar, in an overgrown field near Ballyshannon has shocked the local community.
He eased out of the tunnel, moving onto a ledge twenty feet above a wide chamber, its floor broken and dotted with stone mounds.
We had been under way again for some time when the smooth prairie became pimpled with gray stone mounds rising ever higher.
During their first visit they identified a few exposed shaped stones fitted together at some of the stone mounds.
The stone mound has a diameter of about 50m.
Going through the columns until he reached a high stone mound with a wide split up its middle, he paused to ponder his next move.