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.'
A Reddit post from earlier this year featured a Google Earth image of Sycamore Knoll with the title: 'Underwater UFO base between Malibu and Catalina Island.'
'Some refer to it as an anomaly while others believe it is an alien base,' a Redditor shared in another post this year.
'It's believed to be between two-and-a-half and three miles wide.'
Sycamore Knoll sits about 2,000 feet below the surface and is located 6.6 miles off the coast of Malibu. It is located at geographic coordinates 34° 1'23.31″N 118° 59'45.64″W.
While Google Earth images from 2014 captured detailed views of the formation, it appears to have been wiped from the platform as of 2025, adding more mystery about its origins.
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