Sycamore Knoll: A Natural Underwater Formation Off Southern California and the Speculation It Sparks

To the point

Sycamore Knoll is a natural underwater feature off Malibu about 2,000 feet deep and spanning nearly five square miles, whose flat oval shape invites alien-base speculation that was popularized by Jimmy Church around 2014 and reported by Lee Speigel with input from USGS scientist David Schwartz, but geologists say coastal forces formed it and Malibu UFO lore plus media coverage keep the mystery alive.

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Sycamore Knoll: A Natural Underwater Formation Off Southern California and the Speculation It Sparks

Sycamore Knoll is a natural, flat-roofed, oval underwater geologic feature about 2,000 feet below the Southern California coast near Malibu, spanning roughly five square miles and about three miles across, formed by coastal geology and ocean forces, while popular speculation—pushed by voices such as Jimmy Church on a podcast—claims it could be an extraterrestrial base; HuffPost writer Lee Speigel reported on the idea and consulted USGS scientist David Schwartz, who maintained it is entirely natural, against a backdrop of many Malibu UFO sightings, Google Earth imagery, and media coverage by outlets including A&E and ABC7, all within the broader folklore of Los Angeles County.