York is spot-on - as soon as Celestia picks up the photo, she can hear something faint, almost as though someone is trying to speak with her. It's vague, though, and muffled; while she can hear a faint voice, it's far too quiet to make out any of the words. The only aspect that truly comes through is the tone, one of urgency and desperation.

At the moment, Celestia is the only one who can hear it.