The psychological thriller is based on Yossi Ghinsberg's memoir about an ill-fated trip into the Amazon jungle with two friends and a guide that, needless to say, didn't end well. The story has already been turned into a documentary called I Shouldn't Be Alive for the US Discovery channel but now Mclean has a script in hand from Justin Monjo (Bait) that will ramp up the terror levels.
With the film's distribution rights available to potential buyers at the European Film Market, Mclean is aiming to start shooting later this year in Australia and elsewhere.
Radcliffe caused a splash at this year's Sundance Film Festival with Swiss Army Man, in which he plays a flatulent corpse. He will next be seen here in illusionist heist sequel Now You See Me 2.