Encyclopedia > U > Unidentified submerged object
Unidentified submerged object
An Unidentified Submerged Object, or USO, is defined as any object or optical or mechanical detection phenomenon of unknown origin observed within water that remains unidentified even after thorough investigation. The maritime analog to a UFO, or unidentified flying object, unidentified submerged objects are often seen by those who study unidentified flying objects as a phenomenon the same as or similar, but encountered in water instead of atmosphere.
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