Development As Above, So Below was directed by
John Erick Dowdle from a screenplay he co-wrote with his brother, Drew Dowdle. The Dowdle brothers said they always wanted to make a documentary-style or found footage
Indiana Jones-type film with a female lead.
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
Nicolas Flamel's
philosopher's stone that leads the film's main character, Scarlett Marlowe, into the catacombs. John Erick Dowdle went to Paris in 2007 and tried to see the catacombs, but they were closed due to vandalism. The film went from the pitch to a director's cut in seven months. The film's estimated production budget was $5–10 million. It was produced by
Legendary Pictures and Brothers Dowdle and distributed by
Universal Pictures, making it the first film in Legendary's deal with Universal.
Influences The plot was loosely based on the
nine circles of Hell from
Dante Alighieri's epic 14th-century poem
Divine Comedy. The Dowdle brothers also used elements from their previous films,
The Poughkeepsie Tapes (2007),
Quarantine (2008), and
Devil (2010). Drew Dowdle said they did not want another underground creature movie, and that
Neil Marshall "did that quite well" with
The Descent (2005), they wanted to do something outside of that, but still include an element of the supernatural. With permission from the French authorities, the film was shot in the real catacombs of Paris, and in the off-limits area of the catacombs. The air and water quality in the catacombs were tested before shooting to make sure that people would not walk through
battery acid. One of the catacombs' locations was six flights of stairs down, while another one was through a little hole in the ground. Feldman also said that it was
claustrophobic, cold, wet, tight, uncomfortable and there were no bathrooms in the catacombs, 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". The piano from George's childhood that he sees in the catacombs, was designed to look like a piano that the Dowdle brothers owned and used to jump off as kids. The crew wanted to do a hollow piano, but the Dowdle brothers wanted a real piano, so it had to be taken to the catacombs by a piano mover and later removed after the shoot. That particular quarry where the piano was placed was six stories down and only accessible by a manhole cover with chimney under it and a long staircase. John Erick Dowdle said the piano mover had "the most thankless job" by bringing the piano down there and moving it back out. The Dowdle brothers wanted to shoot in a quarry of the catacombs that was used by the
Nazis to hide bombs during
World War II and had one sign that said "
Adolf Hitler Strasse" ("Adolf Hitler Street"), but it was damaged after being bombed by the allies and the film's safety people advised them not to shoot in there because the ceilings could fall.
Post-production Elliot Greenberg started editing the film while shooting was still happening.
As Above, So Below was edited at the same time as Dowdle's next film,
No Escape (2015). Greenberg traveled to Thailand to work on
No Escape while his assistant finished
As Above, So Below. ==Marketing==