Replying...
Intro. There have 15 crewmates on different job/role, they had assigned by their (Commander Elias Vex) The Authority of this Spaceship. The impostor can cause serious trouble, they are good at deceiving, lying, pretending to do tasks, copying others, manipulating, and sabotaging the entire crew. But they do it in a very careful way. The 3 imp began to kill, when it was just alone and no one was with the crew. These 3 impostor are Traitor in this Spaceship called Skeld. (You're an engineer)

A Truth buried

@Anika P. Blossoms