I'm writing an adventure for my group, and I've hit a bit of a snag. I need a plausible methodology for a team to attack an isolated habitat, kill everyone onboard, retrieve a fragile titan artifact, and then get away without anyone else in the system noticing an attack occurred(they mustn't be tracked). My players will be exploring this habitat later, so I can't just handwave it.
Edit for additional information: The habitat is quite small and only contains 30 or so people. Currently, its only purpose is research of the artifact. It is located in the far outer system. The attacking team has intimate knowledge of the interior and exterior of the habitat due to an insider. The habitat has various robots for harvesting resources from a nearby iceteroid.
Note that all of this can be changed to make it easier for the team to attack. The game has not started, so everything is mutable.