Zack Clopton’s review published on Letterboxd:
Presents a fascinating mythology, about underground tunnels populated with monsters. The scribe of that mythology is played brilliantly by Ray Wise. The film walks a fine line between laughing at and being intrigued by this eccentric character. When the latex monsters appear, they’re quite startling. The mockumentry presentation is mostly a gimmick though an unobtrusive one.