Are there any real deep sea trenches where USOs could exist?
Yes, There have been multiple reports off the Atlantic Shelf, and in the pacific. Most of the USO reports have actually been reported by the US coast guard! There was a recent show on discovery or history channel about USOs and the places where they have been seen. There was one in the Pacific near a VERY DEEP SEA trench that ACTUALLY was followed by both the coast guard and part of the Navy Pacific Fleet. Some have been seen in deep lakes where one ship emerges and then smaller ships fly off it! So basically There are SO MANY places too deep to be discovered because of lack of funding and technology to do such. There are many accounts in the North Sea near NORWAY where They ACTUALLY CUT OFF THE HARBOR because they had on RADAR an actual USO, they fired upon it and it somehow escaped the navy barricade! I hope this helps. It could be a top secret military base underwater or Real USOs from another world. That’s some food for thought, Hope that helps!