Unidentified Submerged Objects: History, Theories, and Notable Encounters

To the point

USOs are underwater versions of UFOs—unexplained objects with unusual movements and possible advanced tech—described for centuries, including Christopher Columbus in 1492, and explained by four main ideas: advanced underwater craft, extraterrestrial or interdimensional beings, unusual marine life, or unknown natural phenomena; evidence from sonar, submersibles, and encounters like the 1971 USS Trepang and the 2004 Nimitz fuels ongoing debate about intelligent life that could operate in both sea and air, while practical challenges and global interest keep the discussion alive.