As Above, So Below is a 2014 American horror film[6] written and directed by John Erick Dowdle and co-written by his brother Drew.

The film stars Perdita Weeks, Ben Feldman, Edwin Hodge, François Civil, Marion Lambert, and Ali Marhyar.

It is presented as found footage of a documentary crew's experience exploring the Catacombs of Paris and was loosely based on the nine circles of Hell from Dante Alighieri's epic 14th-century poem Divine Comedy.

Scarlett Marlowe is a young scholar, continuing her dead father's search for the philosopher's stone, a legendary alchemical substance discovered by the alchemist Nicolas Flamel.

They find a drawing of a door on the ceiling along with a Gnostic Star of David, symbolizing "As above, so below", which reveals a hidden opening in the floor.

Going through, they find a tunnel marked with the phrase "Abandon all hope, ye who enter here" in Greek, identical to the script on the entrance to Hell in Dante's Inferno.

George admits that he failed to save his brother from drowning, and Zed confesses that he has an illegitimate child he has refused to claim.

[10] Thomas Tull, the head of Legendary Pictures, called them and said he would love to do something in the Parisian catacombs, and the brothers said that it would be perfect if the characters were searching for something down there, which turned out to be Nicholas Flamel's philosopher's stone that leads the film's main character, Scarlett Marlowe (portrayed by Perdita Weeks), into the catacombs.

Production in the actual catacombs was difficult for the cast and especially the crew as there was no electricity or cell phone service in the centuries-old tunnels.

"We would go into the trailers and get covered in blood, dust, scars, and gore, and then grab our coffees, and have a leisurely stroll through a hospital parking lot past doctors and patients all staring at us.

[15] Drew Dowdle said it was very hard spending four hours down in the catacombs and then coming out into Parisian June, and that they could not handle any sunlight and became "mole people".

[10] John Erick Dowdle said that both the actors and the crew were asked if they were claustrophobic, and then they did a wardrobe test underground to make sure they were not.

[17] Other filming locations in Paris were the Fontaine des Innocents, the Père Lachaise Cemetery, the Musée de Cluny, the Pont Alexandre III and the Eiffel Tour.

[19] YouTuber PewDiePie and his wife Marzia Bisognin promoted the film by embarking on a quest into the catacombs, where they would be scared in a variety of ways.

The website's critical consensus reads, "After an intriguing setup that threatens to claw its way out of found-footage overkill, As Above, So Below plummets into clichéd mediocrity.

[23] Peter Debruge gave the film a mixed review in Variety, writing, "It all makes for clumsy-fun escapism, not bad as end-of-summer chillers go, but small-time compared with other Legendary releases."

The stakes begin as gut-wrenchingly real with the team feeling disoriented hundreds of meters beneath the streets, but the film gets downright silly once the caverns become malevolently sentient.

"[26] Peter Bradshaw stated in The Guardian, "There are some interestingly contrived moments of claustrophobia and surreal lunacy, but this clichéd and slightly hand-me-down script neither scares nor amuses very satisfyingly.

"[27] Drew Hunt expressed similar sentiments in The Chicago Reader, writing "An intriguing and intensely creepy premise is squandered on this rudimentary found-footage horror film.

"[28] Terry Staunton gave the film a mildly positive review in Radio Times, stating, "It's a perfectly serviceable addition to the 'found footage' genre of chillers from director/co-writer John Erick Dowdle (Devil), who puts cameras in each character's helmet, allowing quick cuts from one scene to another.

"[29] The entertainment oriented website JoBlo wrote, "Not the worst example of found footage by a long shot, and it moves a decent pace with a couple of good scares.