In Episode 185, Jeff Belanger and Ray Auger head to Deerfield, New Hampshire, in search of a 175-year-old mystery thundering from below ground. Between 1834 and 1846, a series of explosions emanating from below ground were reported in the southern part of town. The sounds were as loud as cannon fire, and the concussion could knock over a stone wall. The only problem is no source was ever found, and earthquakes don’t behave this way. The events made the local papers for years. Scared locals pleaded with the scientific community for answers, but none could be found. Some speculate it could be secret underground mines, trolls, or even an underground UFO base.