USO's unidentified submerged objects

An Unidentified Submerged Object, or USO, is defined as any object or optical or mechanical detection phenomenon of unknown origin observed within water that remains unidentified even after thorough investigation. The maritime analog to a UFO, or unidentified flying object, unidentified submerged objects are often seen by those who study unidentified flying objects as a phenomenon the same as or similar, but encountered in water instead of atmosphere. Likewise, many sightings of USOs constituting "typical" UFOs emerging from the water are seen as a subset of the latter rather than the former. Although identifying and dispelling unidentified flying objects has typically been important to militaries as a national security issue, the comparatively rare USO sightings have not been reported as national security threats or caused the form of sensation that typical UFO sightings often have.

USOs and ice
Unidentified submerged objects are occasionally reputed to have flown into and out of bodies of water that are choked with heavy ice coverings as if the ice presents no barrier whatsoever.[1] After these reports, large holes have been observed that do not appear marked by catastrophic impact, an ability to melt ice at speed of transit has been proposed. Examples of this have occurred in places like Norway and Sweden where these objects have been reported flying into and out of the water in the area.

USOs and theories of origin and purpose
USOs that remain underwater are sometimes thought to have been tricks of the light caused by refraction and turbulent flow, or large water creatures.
Because of this close relation to water, unidentified submerged objects have occasionally been suggested to be controlled by the theoretical aquatic people of Atlantis. Most theories connecting the supposed beings to USO phenomena explain the people of Atlantis, as being a technologically superior civilization perhaps something other than human.

It is also possible that another or various other civilisation co -inhabit this planet - perhaps way before humans had clain over this planet.....
Could these beings have been here all the time....
Perhaps so.......