Unfathomable: 20 Wild (but True) Stories About the Ocean by Mary Boone

Unfathomable: 20 Wild (but True) Stories About the Ocean

Mary Boone

Random House Children's Books · Hardcover · February 17, 2026

Wrestle an octopus, swim through a sunken city, and discover 20 incredible-but-true stories from our unbelievable—and unpredictable—oceans.

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Who it’s for
True ocean tales pair strange events with science and history.
Themes
Ocean discoveries, Survival at sea, Marine life
Genres
Oceans, Lakes & Water, Wonder & Curiosities, Marine Life

About this book

Wrestle an octopus, swim through a sunken city, and discover 20 incredible-but-true stories from our unbelievable—and unpredictable—oceans. From acclaimed nonfiction writer Mary Boone comes an illustrated look at the fascinating stories that take place under (and above) the sea. Did you know you can survive being swallowed by a whale? Or that octopus wrestling used to not just be a pastime but also an actual sport?

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Or, that once a town in Oregon didn't know what to do with a whale carcass that washed up on their beaches, so they...BLEW IT UP? As strange as it sounds, those stories are 100% true. And the sea holds more secrets. Grab your snorkel and dive into 20 incredible-but-true tales of survival at sea, sunken treasures hiding under the ocean's surface, jellyfish that live forever, and so much more. From accomplished nonfiction author Mary Boone comes an illustrated look at the unfathomable tales our oceans have to tell. Each chapter contains one story, with interview quotes and hands-on research that uncovers the science and history behind the event. You’ll get facts AND more! A Junior Library Guild Gold Standard Selection

Ocean Stories, Explained

True ocean tales pair strange events with science and history.

Come here for

  • True stories of survival at sea
  • Sunken treasures beneath the ocean’s surface

Expect

  • One story per chapter, with interview quotes
  • Science and history behind each event

Where it sits

Marine Life66%
Oceans, Lakes & Water51%
Wonder & Curiosities44%

Percentages are BookFrontier’s reading of the book.

Publisher categories

  • Marine Life
  • Oceans, Lakes & Water
  • Ecosystems & Environment
Authors
Mary Boone
Publisher
Random House Children's Books
Published
February 17, 2026
Format
Hardcover
Theme
Ocean discoveries · Survival at sea · Marine life
Reading lane
Marine Life