In "Digging Up the Marrow," filmmaker Adam Green sets out to explore the possibility that monsters truly exist after being contacted by a mysterious man named William Dekker, who claims to have proof of their existence. Green's journey takes him deep into an underground city, where he captures footage of the creatures but struggles to distinguish between reality and hoax. As he delves deeper into the truth, Green finds himself in a dangerous game of cat and mouse with the monsters and the enigmatic Dekker, who may be hiding a dark secret.

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Some movies that have similar genres and were produced around the same time as Digging Up the Marrow include Strange Nature, Paranormal Activity 4 (Extended Edition), Mermaid Down, Styria, Almost Invisible, Next of Kin (1982).