The Spelunkers (Basinville Series.)

Urban legend tells of the Spelunkers, large beings that live under Basinville who haunt the old mines. The legends say they deviate from sometimes helping, sometimes harming people. no one has ever seen one and told a (comprehensive) tale about them. But the town's legend is steeped in references to them. They appear like miners who used to mine beneath the city before the mines shut down. some say they're ghosts, some say they're something else.