Ruins of Pictor

Antiquity Journals #1
Aliens don’t exist. Humans are alone in the galaxy. Except we’re not. Aliens do exist. It’s just this part of the galaxy that’s devoid of alien life.
Ancient ruins of a civilization have been discovered on another world. Solving the galactic-sized mystery of who built it requires a special group of people with a unique set of skills. While their parents are examining some alien ruins, Zack, B, Grant, Dana and Gordy get a chance to explore the planet. But a mishap lands them deep underground in a part of the ruins that no one knows about.
Will what they discover down there solve the mystery or add to it?