Daniel Radcliffe's survival skills are tested in new Jungle trailer

I’ve a feeling we’re not in Hogwarts anymore.

In the based-on-real-events survival-thriller Jungle, Daniel Radcliffe plays Yossi Ghinsberg, an Israeli backpacker who, together with two friends, set off from the Bolivian city of La Paz on what was supposed to be the adventure of a lifetime. Leading the way into the uncharted Amazon was an Austrian expat named Karl Ruprechter, who had met the friends just days before and claimed to be familiar with the region. But their dream trip soon turned into a wilderness nightmare from which not all of the men returned. The film is based on Ghinsberg’s subsequent book about the nightmarish trip.

“It’s about this guy that got lost in the jungle and survived on his own for three weeks,” Radcliffe told EW last year, during the film’s shoot in Australia. “It’s testing everybody: the crew, myself, everyone. It’s a very intense but a very seriously fun shoot.”

Jungle is directed by Greg McLean, whose previous credits include the two Wolf Creek films and this year’s James Gunn-scripted The Belko Experiment. The film costars Alex Russell, Joel Jackson, and Thomas Kretschmann.

Momentum Pictures is releasing Jungle in theaters, on demand, and digital HD on Oct. 20. You can watch the film’s new trailer exclusively above.