Download or read book The Underwater Planet (Geronimo Stilton Spacemice #6) written by Geronimo Stilton and published by Scholastic Inc.. This book was released on 2016-01-26 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spacemouse Geronimo Stiltonix's adventures are out of this world! While at the beach, Geronimo Stiltonix stumbles upon a mysterious treasure map! The spacemice follow it and end up on Aquarix, a planet that's entirely underwater. During their exploration, they face fur-eating seaweed, ferocious piranha aliens, and . . . pirate spacecats! Squeak! Can the spacemice keep the spacecats from stealing the treasure?