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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
The USO Files: The Underwater UFO Mystery What Military Insiders Claim About Unidentified Submerged Objects in Earth's Deepest Waters

The USO Files: The Underwater UFO Mystery What Military Insiders Claim About Unidentified Submerged Objects in Earth's Deepest Waters

Pierce, Matthew

Paperback

UFOs & ExtraterrestrialsNaval History

Currently unavailable to order

ISBN10: 1801714991
ISBN13: 9781801714990
Publisher: Planetufo Books
Published: Jun 8 2026
Pages: 198
Weight: 0.60
Height: 0.42 Width: 6.00 Depth: 9.00
Language: English
What if the greatest UFO mystery is not in the sky... but beneath the ocean?

For decades, people have looked upward for answers about UFOs, strange lights, and unexplained aerial objects. But some of the most disturbing reports do not come from the clouds. They come from naval crews, sonar operators, submariners, and military insiders who claim that something unknown may be moving through Earth's deepest waters.

Objects detected by sonar. Lights seen beneath ships. Fast-moving contacts that appear, vanish, and maneuver in ways that seem impossible for ordinary submarines. Craft allegedly entering and leaving the ocean without impact, splash, or visible damage. These are the claims behind one of the least understood mysteries of the modern UAP conversation: USOs, or Unidentified Submerged Objects.

The USO Files takes you deep into this hidden side of the UFO phenomenon, where military secrecy, ocean darkness, classified technology, and unexplained encounters collide.

This book does not ask you to blindly believe. It asks a more fascinating question:

what are trained observers, sailors, and submariners actually reporting when they describe objects moving through the ocean beyond public understanding?

Inside this book, you will discover:

  • What USOs are and why they are harder to investigate than ordinary UFO sightings
  • Why the deep ocean may be the perfect hiding place for unknown activity
  • How sonar contacts can reveal strange underwater movement, and how they can also deceive
  • What sailors and naval personnel claim to have seen beneath the waves
  • Why submariner testimony is so compelling, but often hidden behind secrecy
  • The mystery of transmedium objects said to move between air and water
  • How naval bases, restricted waters, and military training zones became USO hot spots
  • Historic ocean mysteries, Cold War underwater incidents, and modern UAP connections
  • Natural explanations such as bioluminescence, sonar distortion, marine life, and ocean illusions
  • The possibility of secret military technology, foreign surveillance systems, or something even stranger

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