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In Ufology, “transmedium” describes any craft (any UFO) which is spotted while in flight passing from the air and into the water, or else from water into air. Once the UFO is in the water, it is then classified as a USO, or an Unidentified Submerged Object. Conceivably, a transmedium craft can (by definition) likewise pass from the air and into outer space, and also pass through other permeable substances as lava, mud, or sand. However, virtually 100% of all accounts of transmedium behavior have described transmedium craft as passing back and forth between air and water. Witnesses who have seen transmedium craft passing from air to water and (vice versa) universally claim the craft they saw made the transition from one medium to the other smoothly, seamlessly (neither accelerating nor decelerating), and exhibited no degree of compensation or recalibration to its velocity or trajectory.
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