Mystery beneath waves: Possible underwater UFO base discovered off California coast

A curious underwater structure, known as Sycamore Knoll, has reignited global fascination and conspiracy theories. Sitting 2,000 feet beneath the Pacific Ocean, just 6.6 miles off the coast of Malibu, the formation has long been known to scientists but is now at the centre of growing claims that it could be a hidden alien base. Once visible on Google Earth in 2014, images of the formation have since disappeared from the platform by 2025, intensifying the mystery. Meanwhile, the structure remains viewable on alternative mapping tools like fishing apps, keeping curiosity alive among researchers and enthusiasts.

Reports of unidentified flying objects (UFOs) near Sycamore Knoll have flooded platforms like the National UFO Reporting Centre. Witnesses describe massive, glowing objects plunging into the ocean without sound or splash, a phenomenon some attribute to advanced, non-human technology.
A California resident described spotting a “cathedral-shaped craft” vanishing beneath the waves in an instant, while popular forums like Reddit have buzzed with theories labelling the site an "underwater UFO base."


Backing these claims are testimonies from military insiders. Congressman Tim Burchett recently revealed that a senior Navy admiral informed him of an unidentified object, the size of a football field, moving at hundreds of miles per hour underwater. Such behaviour goes far beyond the capabilities of known human technology.
Adding to the intrigue, investigative journalist Jeremy Corbell released newly declassified footage captured aboard the USS Jackson in 2023. The video shows a self-luminous, wingless craft rising from the Pacific Ocean. It is the latest in a string of mysterious "transmedium" UFOs capable of moving seamlessly through air and water.

Experts like Corbell link the Sycamore Knoll mystery to decades of consistent UFO sightings around Warning Area 291, a military training zone off Southern California. Events like the 2004 Nimitz Tic Tac encounter and the 2019 Navy warship swarm also occurred nearby, suggesting a long-term presence of unknown intelligences in the region.
According to a Navy combat information centre (CIC) operator, four unknown aerial objects were recently tracked on radar and observed performing synchronised, physics-defying manoeuvres before vanishing. This supports claims that these objects might operate from underwater facilities like Sycamore Knoll.
Could Sycamore Knoll be humanity’s closest encounter with an underwater extraterrestrial base?
As evidence mounts, the line between science fiction and reality appears thinner than ever.