The Tomb helmer Mikael Hafstrom is now focusing on Tunnels, the fantasy adventure book series acquired by Relativity Media. The script by Andrew Lobel is based on the adapted screenplay originally written by Joel Bergvall & Simon Sandquist. Tunnels is the film adaptation of the first installment of the novel series from Scholastic/Chicken House publishing, by authors Roderick Gordon and Brian Williams, which has sold more than 1 million copies and has been published in nearly 40 countries worldwide.

The authors have already completed five sequels with the sixth and final book in the series, Terminal, will be published in the U.S. in the fall. The property was unearthed by Barry Cunningham, the man credited with discovering Harry Potter creator J.K. Rowling and whose boutique Chicken House imprint is part of Scholastic. Beneath the streets of London, two teenage boys discover an incredible, hidden underground world where a secret civilization has been desperately waiting for a hero to save them all. The deeper they go, the closer they get to unearthing an evil that could destroy the world above and put an end to the lives they once lived.

Mark Canton, Neil Canton and Danny Davids are producing with Ryan Kavanaugh. Relativity’s president Tucker Tooley will executive produce with Kelly Dennis, and Atmosphere’s David Hopwood will serve as co-producer.