What reading level is Trapped at the bottom of the sea?

Trapped at the bottom of the sea by Frank E. Peretti is at a Level 5-6 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is Trapped at the bottom of the sea appropriate for?

Trapped at the bottom of the sea is recommended for Ages 9-12. HootRating: 10MP (Moderate — Physical). Content flags: Physical Danger, Mild Peril.

What genre is Trapped at the bottom of the sea?

Trapped at the bottom of the sea is fiction — Juvenile Fiction. Part of the Cooper Kids Adventure series.

Does Trapped at the bottom of the sea have any content warnings?

Trapped at the bottom of the sea has a HootRating of 10MP (Moderate — Physical). Content flags include: Physical Danger, Mild Peril. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Trapped at the bottom of the sea?

Trapped at the bottom of the sea by Frank E. Peretti is 144 pages (approximately 38,455 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

Trapped at the bottom of the sea

Frank E. Peretti

Trapped at the bottom of the sea

Age Rating, Reading Level & Content Guide

by Frank E. Peretti

Cooper Kids Adventure

Reading Level 5-6 10MP Ages 9-12 Matched

The text is written at a 5th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content has moderate intensity with some emotionally heavy themes.

Buy on Amazon Listen on Audible

We may earn a commission from these links. Bookshop.org supports independent bookstores with every purchase.

About This Book

Lila Cooper finds herself trapped deep beneath the ocean in a hidden weapons pod, hoping her family can save her before her air runs out. Her brother and father face a thrilling race against time and dangerous foes to bring her home safely. Courage and family bonds shine through this underwater adventure.

Themes

Adventure FamilyChristian Life

Quick Assessment

This is a Level 5-6 book with moderate content intensity. Content themes include physical danger, mild peril. Written for readers ages 9-12.

Why we rated Trapped at the bottom of the sea 10MP

Trapped at the bottom of the sea is written at a Level 5-6 reading level across 144 pages (approximately 38,455 words). Strong independent readers around grade 6.7 can typically handle this book on their own; with parent or teacher support, Trapped at the bottom of the sea works for readers up to grade 7.7.

Read aloud, Trapped at the bottom of the sea runs about 4.3 hours — long enough to span several bedtime sessions.

We rate Trapped at the bottom of the sea as 10MP ("Moderate — Physical") because the content sits in the "Moderate" range — moderate conflict that may involve loss, scary scenes, or interpersonal stakes. The strongest signals come from physical peril — these are the dimensions parents should evaluate against their reader's tolerance.

Specific content flags noted by reviewers: Physical Danger, Mild Peril.

Thematically, Trapped at the bottom of the sea explores adventure, family, and christian life — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Readers who like a steady plot with enough momentum to keep pages turning.
✓ Kids drawn to stories about adventure, family, christian life.
✓ Readers who fall hard for one book and want a long series to live in — there are 6 more books in the Cooper Kids Adventure series.