Warning Beacon: The little used warning beacon is often confused for a distress beacon, but is in actuality an attempt (either by Precursors or the last expedition) to be responsible and keep curious parties from coming anywhere near the certain death that awaits them. Of course, there would be no plot if they immediately decode it or heed it, now would there? Besides, they should have factored in the lure of Schmuck Bait and thought of just keeping silent.
...or put the warning beacon next door (say, on a moon), with a note.
...or put the warning beacon next door (say, on a moon), with a note.