Aliens & UFOsMysterious underwater ‘UFO base’ spotted just 6 miles off the West Coast Posted on May 3, 2025 by Administrator A mysterious formation lurking deep in the ocean has been spotted just a few miles off the coast of Southern California. Geographically known as Sycamore Knoll, the natural underwater structure looks like a bump pushing up from the ocean floor, with a flat, table-like top. It has been studied by scientists for years, though recent claims by conspiracy theorists have suggested Sycamore Knoll might be an underwater ‘alien base.’