A group of unconvincing, hipster-looking soldiers commit a war crime then find themselves doomed to ascend an endless stairway unless they go back and stop themselves committing the crime. This is ultra-cheap stuff, largely shot in the stairwell of some ugly modern building with a horrible visual style that sees most of the footage tinted nasty greens, blues or mock black & white with a few rubbish cgi explosions. The story is scant and badly told - the barista-soldiers seem to arrive at the idea that they're trapped on a stairway to hell inordinately quickly - and it's all very repetitive with lots and lots of re-used footage. All of this takes up over 100 painful minutes of screentime.
I watched it so you don't have to.
Thanks, I won't