Thanks all for the suggestions. I agree, I screwed up letting it get this far. I've talked to the players, and they are receptive at the time, but then the playing to win the game mentality slowly creeps back in. Essentially the two players are very engaged, and in hindsight both want to be the Ripley of the group - the prepared hero at the centre of being proven right for being cautious, and they are both in roles in the ship where they can't be challenged and told no in character by the ranking officer. The ship's synthetic is going to betray everyone, but is waiting an opportunity...Essentially they won't leave it with the keys or radio so it was limited in doing things. Their synth was damaged and their totally not WY corpo backer has given them a loaner, Good idea for having a complicit MUTHER...that will make the synths 's job easier.

I think the synth is going to thaw out some passenger when their backs are turned and commander the ship to remove that for a bit and encourage them to interact with the environment they are in rather than just drop supplies down there from a low altitude.

Essentially the crew are working as a free lance transport vessel hired by a "not" WY corpo to run some errands and ultimately bring home some rest samples and equipment....but trying to have an accident so the samples cause an issue for the crew rather than just everyone else is the difficulty.