Another IC Note

As with the first one you find a letter lying on your pillow one night. This one reads…

"Do you believe everything you're told? Look to the skies! When you see the sign you will know we are right. Danger is coming."

You still don't recognize the handwriting, and later on your way to the living cavern someone bumps into you and whispers "Beach. Tomorrow." By the time you turn round they've vanished into the crowd.