Ok a hard one i think, What is that movie about an experiment?

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.