- HD 1080
- Runtime: 98m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Adam Green
- Stars: Ray Wise, Adam Green, Kane Hodder, Mick Garris, Rileah Vanderbilt
- keywords: monster, nightmare, biography, woods, mockumentary, creature, art, found footage, horror filmmaking, underground tunnel
- Production_studio: ArieScope Pictures
- Slogan: Believing is seeing.
- providers: AMC Plus Apple TV Channel, AMC+
- The Digging Up the Marrow is featured in the top rankings of 2015
- #93 in Top Horror Movies of 2015
A documentary filmmaker turns his lens on an enigmatic conspiracy theorist who claims he's found the entrance to a vast underground city populated entirely by monsters.