There was a group of people all dressed in white in a big room…also white. There was one door and a little box on the wall that contained a gun. Someone else had the key i believe. I don;t know what the experiment was about i do know that they start dying or even killing each other. I also remeber vaguely that once in a while somebody would come in the room and kill or drag somebody out.
could they not be wearing white?
              
              
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          Maybe The Belko Experiment (2016)?
              
              
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          breathing room?
cube 2?
              
              
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          nine dead?
              
              
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          killing room (2009)?
              
              
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          Wild guess…
              
              
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          aquarium
              
              
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          do you remember if it was in english? could it be a tv show episode? i am struggling but looking very hard.