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Geronimo Stilton Spacemice #6

The Underwater Planet

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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?

128 pages, Library Binding

First published January 26, 2016

146 people are currently reading
491 people want to read

About the author

Geronimo Stilton

2,003 books3,152 followers
A pseudonym of Elisabetta Dami, see also Tea Stilton.

Elisabetta Dami is an Italian author that currently resides in Italy. She is the author of the Geronimo Stilton series, a bestselling childrens book. She enjoys traveling the world seeking ideas for her series. She writes under a pseudonym of Geronimo Stilton. She is also a co-owner of Italian based publishing company Edizioni Piemme.

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Community Reviews

5 stars
271 (58%)
4 stars
104 (22%)
3 stars
63 (13%)
2 stars
17 (3%)
1 star
9 (1%)
Displaying 1 - 13 of 13 reviews
Profile Image for Vitor.
30 reviews
June 25, 2018
I like this book. But the other books ware more fun so I don’t really like it
Profile Image for Liz.
564 reviews5 followers
April 21, 2020
An underwater civilization???? I got major Atlantis vibes from this one and I love it. Plus a secret treasure that was presumed lost forever. How fun!
Profile Image for Edward Davies.
Author 3 books34 followers
February 22, 2021
Not as bad as some, but some of the character appearances felt a bit forced.
Profile Image for Poorvika Karri.
20 reviews1 follower
September 11, 2023
It is mousetacular!!!
This entire review has been hidden because of spoilers.
Profile Image for Carol H..
279 reviews
December 19, 2023
Read a kids book: check
My sons and I loved reading Geronimo Stilton books when they were younger.
Profile Image for Funteam.
19 reviews
May 15, 2025
kalau ini gk usah diragukan
cocok banget buat anak2 bahkan dewasa sekalipun
Profile Image for Lorie.
764 reviews11 followers
October 13, 2016
Geronimo Stilton and his crew are off on a new series of adventures that take place in outer space. It begins with Geronimo finding a mysterious sphere on the beach biosphere of his MouseStar 1. The sphere is a map that leads them to an underwater planet filled with many unforeseen dangers. When they finally reach their map destination, they find a peaceable civilization that needs the sphere to open a locked treasure chest of great importance to them. Just then, who should arrive but Black Star and his band of Space Pirates and they mean to steal the treasure. Can Geronimo save the day?

This is the sixth volume in the SpacemIce series for beginning chapter book readers. Most fans of the other Geronimo Stilton books will enjoy this title. The fast moving action, color illustrations, paperback format all make this appealing for readers who are on a second to fourth interest grade level.
I would recommend this book for purchase by any school or public library.
This book was provided by the publisher for professional review by SWON Libraries.
10 reviews1 follower
June 21, 2016
My kids loved this book! I have a 4 & 5 year old and I had to read this to them! But I enjoyed it just as much as they did. They were more interested because there are some pictures in the book. I recommend this for kids of all ages they will love it and because there is a series they will be able to have much more of these fun stories!
Profile Image for Kaytee.
426 reviews7 followers
May 10, 2016
every book with geronimo stilton in it is very exciting but this was the most exciting one of the creatures are kinda scary but this book was still good.
Displaying 1 - 13 of 13 reviews

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