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USO
Unidentified objects are not just confined to the sky. In fact throughout the seas, oceans, as well as lakes and rivers of the world, strange metallic objects have provoked just as much curiosity. In this case they are abbreviated as USO's - Underwater Submarine Objects.

In many cases the line separating UFO's from USO's is a slender one. Not infrequently such objects will catapult themselves from the sea to hover above the waves before vanishing at amazing speed.

http://www.space-2001.net/html/uso_.html