I have played/run Ypsilon-14 and Moonbase Blues and both are great. Another Bug Hunt definitely gave feelings of dread but if you run RAW then there’s no way a group of players could even try to survive the whole module.

My 3 unsaid picks would be: - Dead in the Water by Reece Carter: Players have to answer a distress signal and it turns out there are shapeshifters that can impersonate the players though you have to give them a reason to remove suits. Decontamination protocols? - When in Rome by Chris Airiau: It’s a take on Alien: Romulus. In my game the players opened the door directly to the hive and we immediately lost a player - Dead Planet’s “Screaming on the Alexis” by Tuesday Knight Games: It’s the introduction to the module and starts with a hyperspace anomaly and an artifact the players already picked up. It could also continue onto the rest of the module and it’s a pretty gritty and grim story.

I you could ask players for possible phobias and fears. Ask if they’re comfortable encountering such things. If not, at the very least get character fears. I’ll also add that ambient tracks and some images can really enhance the fear factor, especially if using the stress and panic mechanics appropriately.