It was quite simple really, but the Politos should have subscribed to some form of shape or formation for the layout of their Vaults.
For example, with seven of them, they could be placed equidistantly to form a septagon-like shape.
Unfortunately, this came up as wrong.
Darius then tried to see if it had been layered out with other unique and random shapes that made sense. When they all failed, he moved on to another style, which was logic and security.
In other words, he was now trying to pinpoint the location of Vaults using locations the now-extinct race would have regarded as secure enough and hard to access.
For example, this sinkhole, when placed against an older map of Pokterr before the Insects had raided everything - which Darius obviously had access to in his Database - was at the bottom of a mountain.
