Code name flood

"Last week, twelve-year-old Sky found a cryptic message from her dad, who mysteriously fled the safety of their underground compound five years ago. The note said the fate of the world depended on her going topside, to a lost world that's ruled by dinosaurs. Today, after a treacherous journey through the wilderness, Sky and her friends have made it to their destination: Lake Michigan. There they discover a hidden underwater lab, and with the help of its scientists, Sky will finally learn the truth about her father's secret mission. Tomorrow, it will be up to Sky and her friends to save humanity from the very edge of extinction"--Provided by publisher.