Buried Alive in Vermont?

Buried Alive in Vermont?
In Episode 51 Jeff Belanger and Ray Auger visit Evergreen Cemetery in New Haven, Vermont, in search of the final resting place of Timothy Clark Smith — a man who suffered from taphephobia — the fear of being buried alive. Smith’s 1893 grave was designed with a chimney and a window. Why did he do it? And what’s down there?