You’ve probably heard before that we allegedly know more about the surface of the moon than the incredible depths of the earth’s oceans. Obviously that’s changing with the development of new technology that’s helping us map the ocean’s floors as well as super high-tech unmanned subs. But when it comes to locations like the Mariana Trench, which at this moment is recorded as the deepest region of all the oceans, at a depth of 35,840 feet, roughly 6.78 miles, could this be the origin of technically superior crafts also known as USOs (unidentified submerged objects). This is exactly what author Ivan T. Sanderson investigates in Invisible Residents, The reality of Underwater UFOs.

The concept of aliens and their craft being more of an earthly phenomenon rather than the standard extraterrestrial theory has always fascinated me. What if the aliens have been here from the start? It’s kind of freaky that they might actually be observing us from below. Sanderson takes us through a whole list of USO accounts that could possibly explain what’s going on. It’s almost too many which explains why it took me a few tries to get through this book. It’s a bit slow at first but I think it’s due to the fact that the book was originally published in 1970 so many of the examples and concepts are a bit dated. But regardless, it’s still well researched with a keen sense of humor and skepticism.

Just one of the many underwater sightings or I should say tracking was that of the United States Navy during a training exercise in 1963.  The Navy tracked an object for four days that was maneuvering at depths of 27,000 feet at 150 knots plus. In 1967, the record dive for a standard submarine was 6,250 feet. So what the hell was it?

Sanderson also goes way back in history for some early accounts of USOs such as a report from the Annual Register in 1767. It was reported that a large luminous body appeared from a thick dark smoke over the water. The unknown object then took the shape of a pyramid and shot up the river damaging a house and bridge. Stargate anyone? Or how about in 1879 when Commander J.E.. Pringle of the H.M.S. Vulture reported seeing two giant rotating glowing wheels underwater.

Also touched upon is the Bermuda Triangle, along with vortices and time anomalies, plus the possibilities of underwater civilizations, and unexplained vanishing of people and objects.

Although Sanderson tends to be long-winded at times reporting on one of the most neglected areas of ufology, Invisible Residents contains a wealth of information on a subject that begs for further investigation.