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.
The passengers on the yacht all looked up and beheld a
UFO flying across the sky above the open sea. It seemed at first to the onlookers to be heading downward into what they assumed would be a controlled crash or a
water landing. But then they saw the UFO pierce the
water and disappear beneath the surface, proving itself to be a transmedium craft.
