Maybe that's why, at the climactic moment when a bloodied arm reaches up through the weedy ground for the light of day, Marshall himself seems a tad overwrought — cancelling his account with Deliverance and taking on a whole new debt to Carrie.
This is also when the filmic allusions start piling up into their own sort of zombie brigade: scare quotes, if you like, from Don't Look Now, Carrie, Apocalypse Now, The Blair Witch Project, the Gollum sequences in The Lord of the Rings, The Texas Chainsaw Massacre, the original Alien, and in one sudden flash-reveal of a whole brigade of crouching monsters, a direct lift from Aliens.
They include explicit allusions (in addition to the movies already mentioned above) to " Picnic at Hanging Rock ," " Carrie ," “ 2001: A Space Odyssey ,” " The Third Man ," "The Fourth Man," " Don't Look Now ," " The Blair Witch Project " " Vertigo ," " Apocalypse Now "... and plenty more.
Until an overwrought finish out of Carrie, Marshall keeps you guessing with nightmare-making skill.
The final sections of The Descent which manage to evoke Ridley Scott's Alien (1979), Brian De Palma's Carrie (1976), Francis Ford Coppola's Apocalypse Now (1979) and even Rob Zombie's House of 1000 Corpses (2003) are bloody, brutal and tense.
Buckets of blood are spilled, including one memorable image that pays loving homage to the final scene of Carrie.