[Her voice is tight. She might be recovering fast thanks to the technology here, but still--those people are missing, hurt, and does he honestly believe they'll sit by and do nothing?]

You do realize that even if you refuse to tell us, there will likely be a group of people who will go looking? Which sounds better: a small group blindly stumbling upon this place in the hopes of rescuing them or at least finding out what happened? Or a large organized expedition with everyone knowing what's going on and looking out for one another?