The movie was made for a film school-application , although it was liked by everyone, including the teachers and the other participants, Nicolas F. Costoglou didn't get into the school, because he was "(...) to good, so other's should take the place instead, who aren't as experienced, but you can try next again next year!". He didn't...
The three Actors who played the Protagonists didn't knew each other that well, and bonded other the course of filming, they where all friends of the director, but from different circles of friends. They are all still in contact with each other.
The ADR for some of the lines at the beginning (mainly the bickering between the two friends in front) was recorded on a cemetery, because of the silent atmosphere and simultaneous forest-like background noises.
The scene in which the friend who stepped on the landmine tries to calm himself down, and everything seems to get quiet around him, actor Kaan Aygün was actually filmed a day later without the other two actors to strengthen the feeling of blending them out of his mind.
The moment was based on the short-story "A Descent into the Maelström" by Edgar Allan Poe, which was also about survival, the power of nature, and to stay calm in the face of danger.
Because the movie was part of a film school application, they had to follow the guidelines of making a movie which can't be more than 3 minutes (that's why there is a director's cut which is 1 minute longer), and they weren't allowed to use music, so the sound-design was very important. Nicolas F. Costoglou did all of the sound editing himself, including nearly all of the steps the characters take, their voices being partly dubbed over (because of the crackle of the leaves, while they where walking you couldn't really here them talk), of course the background forest noises (with individual birds, for every one of the three characters), and all of the breathing noises Kaan Aygün is making.
The trivia item below may give away important plot points.
Against popular belief, the explosion at the end was real, self proclaimed explosives "expert" Frank Jannusch build the device out of the plastic shell of a Kinder Egg and some explosive material. He also used an fuse which was originally intended for the light flash of an old camera. The explosion was filmed in an remote forest nowhere near the one the rest of filming took place and two cameras where used to get it all in one shot, luckily it worked, although some of the ground didn't stop burning for a few minutes, which can also be seen in the Outtakes.