Planet X91 the underwater cave is the third book in this sci-fi adventure series. Clay Silver 16, Florian Fawkes 15, Josh Quinn 12, wake five minutes before crashing on what they think is an uninhabited planet. The three have to be a team to survive. What new dangers await them? Will they be rescued? One bad mistake and the newest human colony of three will be extinct. For twenty years the animals on board the Piper have roamed free. Now they're hungry for human blood. Abandoned and alone the three young adults have to fight to survive. After the aliens leave, Florian, and Clay, decide to go for a swim. They have no idea snake like creatures can turn the water in the cave they're trapped in to ice. The dinner bell is ringing. They're the main course.