What is the importance of Middle River, Maryland in the novel, Unbreakable?

Middle River, Maryland is the location of the second disk for the shift. It is here that a mother and her child ended up dying in a well. This setting is important because Kennedy starts to prove herself here when she dives down into the well to save Priest from drowning. By the time they return with the disk the well has lettering on it to tell about the next place they’re to look for a disk.