There's a reason that many UFO enthusiasts treat them as possible alien visitors . The "F" in Unidentified Flying Objects rather pointedly directs the interested upward. Science fiction and paranormal investigators alike urged mid-20 th- century readers to "keep watching the skies." And those with abduction stories describe being taken up and away.

Such stories (and a plethora of books, films, and TV shows) have made UFOs the most famous of mysterious objects buzzing about the modern world. But they have a counterpart down here on Earth — specifically, under the seas. There are numerous reports of what have been dubbed Unidentified Submerged Objects, or USOs. It's a term not exclusive to mystery craft; the U.S. Naval Institute has written about several encounters with USOs that were

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