List of sightings of transmedium UFOs

This is a list of sightings of UFOs reported to exhibit transmedium capabilities—objects that allegedly transition between air, water, and/or space. As with UFOs in general, these sightings are generally understood to be transmedium craft, transmedium plasma orbs, or other technological phenomena. The table below includes notable examples, with details about witnesses, location, the first public reporting, and significant notes.

List of sightings of transmedium UFOs

Date	Incident	Witness(es)	Location	First public reporting	Notes
1966	USS Tiru UFO sighting	William Cooper, OOD, and crew	Near Hawaii	1988 (Cooper's first post on Paranet)	A metallic transmedium UFO the size of an aircraft carrier, tumbling between clouds and the ocean. One of the earliest publicized accounts of a multiple-witness military UFO sighting.
1986	Lake Baikal UFO sighting	Local fishermen, residents, and divers	Lake Baikal, Siberia, Russia	2009 (Komsomolskaya Pravda interview with Soviet witnesses)	Reported large, luminous objects entering and exiting the lake. Linked to alleged Soviet military encounters with underwater UFOs.
November 2004	USS Nimitz UFO incident	David Fravor, crew of USS Princeton (CG-59), and pilots of F/A-18 Super Hornets	California coast (near San Clemente Island)	2007 (initial leak to UFO research groups); 2017 (New York Times)	Object described as a "Tic Tac," capable of moving seamlessly between air and water without disruption. Seen on radar and infrared systems.
August 2019	USS Omaha UFO encounter	US Navy crew	Off the coast of San Diego, California	2021 (Jeremy Corbell documentary)	A spherical transmedium UFO was tracked by radar, transitioned from air to water, and reportedly disappeared underwater. Debris recovery attempts failed.

See Also

• Transmedium UFO
• Transmedium craft
• Transmedium plasma orbs
• USS Nimitz UFO incident
• USS Omaha UFO encounter
• Unidentified flying objects
• Unidentified submerged object (USO)