The Alien Colonization of Earth's Waterways: A Reference Guide to UFO/USO Water-related Activity - Paperbackby Debbie Ziegelmeyer (Author) Black and white photo version. See other book options for color versions. As the Director of the Underwater Research and Recovery Team for the Mutual UFO Network, a PADI Scuba Instructor, and an experienced UAP USO investigator, Debbie Ziegelmeyer has studied the USO (Unidentified Submerged Objects) phenomenon for decades. She now brings the culmination of this work to the public in this book. The Alien Colonization of