Right.

The nature of the Bore itself suggests they didn't drill a physical location at all; the source of power was beyond the Pattern, not below ground at a geographical point.... The 'drilling' they did was more on the metaphysical plane - a layer between reality and this "other source of power", not at a physical location before Shai'tan actually touched reality. It created a global weakness in the Pattern and manifested itself most at the resort Island that became SG and that Shai'tan altered, very far from the Collam Daan that was in V'saine, one of the great cities of the last Age.