For decades, shopkeepers did their best to keep the century-old tunnels a secret after a series of break-ins in the interconnected basements.
Even archaeologists hired by the city a month ago to look for the tunnels were not initially informed that they actually were there.
On Aug. 3, the team began to investigate the possible existence of the tunnels using ground-penetrating radar.
Nothing much on the GPR, but it might make an interesting test case for using it since you can do actual ground truthing. (Actually, I hate that term)