If many extraterrestrial civilizations were nearby but trying to keep quiet, how would you suggest drawing them out?
What do you think would finally be their, "Enough, we gotta say something!" situation?
Edit:
Put another way, what might serve as a cosmic icebreaker?
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Broadcast that we've discovered a cheap and hilariously effective FTL but to kick it off requires us to collapse the vacuum decay. We're willing to do it and relocate to the other side of the universe, but we don't want to destroy everything if anyone is around. Answer quick, we're packing