The world of USOs—Unidentified Submerged Objects—offers a treasure trove of alleged underwater UFO bases that continue to baffle researchers and spark endless debate.
Alleged Underwater UFO Base Highlights
10 Underwater Base Off The Coast Of Malibu
California’s reputation as a UFO hotspot makes the discovery of a massive oval‑shaped structure 600 meters (2,000 ft) beneath the water, 10 kilometers (6 mi) off Malibu, feel like a scene straight out of a sci‑fi novel. The formation spans roughly 5 kilometers (3 mi) in width, boasts a flat top, and features evenly spaced pillars that appear to support a colossal “roof,” giving the impression of an entrance.
The story entered the public eye when radio host Jimmy Church of Fade To Black received coordinates from a listener named “Maxwell.” Using Google Earth, Church and his design team captured multiple angles of the anomaly and concluded that it was likely artificial, even dubbing it the “holy grail” for ufologists.
Skeptics push back. Earthquake geologist David Schwartz argues the feature is simply part of the continental shelf, noting he sees nothing extraordinary in the images. Former FBI agent Ben Hansen warns that Google Earth composites can be misleading, as they stitch together data from various sources.
9 Underwater Base Off Puffin Island Wales
Numerous reports of strange lights and solid objects departing the sea around Wales’s Puffin Island have convinced some ufologists that an underwater alien base lurks nearby. A surge of sightings in early 1974 described not only lights but tangible craft exiting the water.
UFO investigator Phil Hoyle says the accounts, though unconnected, share a common narrative: humanoid abductees near the island claim their captors originated from a submerged base. Some even link the site to the legendary kingdom of Cantre’r Gwaelod, suggesting the current occupants could be its descendants.
Hoyle points out that activity around ancient sites worldwide spikes by roughly 80 percent, reinforcing the notion that the Puffin Island phenomenon deserves serious attention.
8 UFO Base Under Lake Ontario
In December 2013, MUFON reported a Hamilton resident who claimed to have spotted several glowing orbs hovering over Lake Ontario, insisting the lake hides an alien base beneath its surface. This wasn’t the first claim of its kind.
Back in August 1981, five motorists observed a dome‑shaped craft soar above the lake before descending into the water and vanishing from view. The mystery may trace back to Jay Gourley’s 1977 book The Great Lakes Triangle, which cataloged numerous disappearances and UFO sightings over Lake Ontario.
Further perpetuating the legend, the 2012 book Underground Alien Bases by the enigmatic “Commander X” compiled more accounts of strange phenomena around the lake, though none have been independently verified.
7 Flight Corridor To Underwater Base North Island New Zealand
North Island of New Zealand has long been a hotspot for odd objects that dive into the sea, with reports extending to nearby offshore islands. Locals assert the region serves as a flight corridor to an underwater base used by these mysterious craft.
Between January and March 1995, dozens of sightings—both nocturnal and daylight—were logged. A standout daylight incident on March 9, 1995, involved two fishermen who saw a bright, silver, ball‑shaped craft emitting a strange red stream. The object vanished in under ten seconds.
Just minutes later, control towers at Hamilton International and Rotorua Airports reported similar sightings, and local radio stations received multiple calls describing the same phenomenon, bolstering the claim of a coordinated flight path.
6 Pacific Ocean ‘Humming’ Is Actually Marine Life Breaking Wind
Scientists led by Simon Baumann‑Pickering argue that the persistent low‑frequency hum detected in the Pacific for over two decades is simply marine creatures releasing gases from their swim bladders—essentially breaking wind. Ufologists, however, dismiss this natural explanation.
The hum, first noted by NOAA in 1991, has been a focal point for both researchers and UFO enthusiasts. Ufologists claim the sound resembles that of electrically powered artificial structures, using it as evidence for secret underwater installations that would require advanced extraterrestrial technology.
Alternative theories suggest the noise could stem from marine vessels or an undiscovered geological phenomenon, but the debate remains lively.
5 Strange Lights And Sounds In Puerto Rico
Puerto Rico’s northeastern shoreline has long been a theater for UFO activity, with countless reports of craft emerging from and disappearing into the sea. The island’s significant U.S. Navy presence adds intrigue, as locals and expatriates claim the military monitors these events closely.
Ufologist Nick Redfern recounts an ex‑civil‑defense employee who witnessed a craft rise from the water before accelerating skyward. A local police officer added that the Navy had spent considerable time tracking an underwater craft along the same coast.
Investigative journalist Jorge Martin analyzed NOAA satellite imagery and identified several large, rectangular anomalies off the island’s eastern and southern coasts. He noted tunnel‑like structures apparently linking these bases to each other and, intriguingly, to the mainland.
In the 1980s, residents of Ponce reported loud, rumbling noises resembling heavy machinery, which ceased after a few days—coinciding with Martin’s alleged tunnels that appeared to connect the underwater installations to the city.
4 Ancient Alien Base At Lake Titicaca
The high‑altitude Lake Titicaca, straddling Peru and Bolivia, is not only the world’s highest navigable lake but also a hotbed for UFO sightings that some claim point to an ancient alien base beneath its still waters.
Nearby lies the ancient city of Tiwanaku, renowned for its sophisticated agriculture, irrigation, astronomy, and construction techniques. Proponents of the ancient astronaut theory argue these achievements imply extraterrestrial assistance, citing statues and texts that appear to depict Mesopotamian underwater deities.
A recent YouTube video captured by a group of Italian travelers shows a disc‑shaped object gliding silently beneath the lake’s surface, suggesting that if an ancient base exists, it may still be operational today.
3 Underwater Alien Base At Guantanamo Bay
A former U.S. Marine who served at Guantanamo Bay in the late 1960s alleges an underwater alien base off the Cuban coast, claiming that numerous UFO sightings of objects entering and exiting the water were captured on film—though personnel were ordered to keep silent.
The Marine described the craft as made of dull metal adorned with blue lights that dimmed as the object sank deeper. Similar sightings have been reported roughly 140 kilometers (90 mi) north of Gulf Breeze, Florida, suggesting a possible shared origin.
In November 1987, Ed Walters reported a bright blue beam that trapped him, describing the surrounding environment as entirely blue. Walters took photographs, sparking a wave of witnesses. MUFON deemed the sighting credible, while critics labeled the photos as obvious fakes. Years later, a model craft resembling Walters’ alleged object was found in a house he once lived in, leading supporters to argue the model was a plant intended to discredit him.
2 Increased UFO Sightings At Lake Erie Cleveland Ohio
Lake Erie, one of North America’s Great Lakes, boasts a long history of strange lights and unexplained phenomena. The Cleveland, Ohio, area, in particular, has seen a surge in UFO reports over recent years.
Robin Swope’s 2011 book Eerie Erie: Tales of the Unexplained from Northwest Pennsylvania compiles numerous MUFON accounts, including a 1988 incident where a mysterious craft landed on the frozen lake. Witnesses Sheila and Henry Baker reported blue and red lights and strange sounds emanating from the ice, accompanied by triangular objects that moved purposefully across the surface before the sounds ceased and the craft vanished beneath the water.
A 2007 news segment highlighted at least 20 sightings within a two‑year span. YouTube hosts several alleged videos, and local researcher Richard Lee notes that UFO activity often spikes around new construction projects, prompting speculation that the sightings originate from an alleged base beneath Lake Erie.
1 Lake Baikal—Scene Of An Underwater Battle With Aliens
Lake Baikal in Siberia, the deepest lake on Earth, has a storied history of UFO encounters and alleged alien activity beneath its waters, dating back to the Soviet era.
Former Soviet naval officer and ufologist Vladimir Azhazha claims to have leaked top‑secret files detailing a 1982 incident where military divers, on routine training, witnessed a massive underwater craft moving at unprecedented speed.
Days later, the divers reported encountering humanoid beings in gleaming suits, equipped with advanced oxygen masks. When the divers attempted to capture them, the beings deployed a powerful sonar‑wave weapon, killing three of the seven divers. The surviving four retreated, injured and terrified.
In 2009, photographs taken from the International Space Station appeared to show two distinct saucer‑shaped anomalies over the lake, bolstering speculation that an extraterrestrial presence—perhaps the very craft described by the Soviet divers—lurks beneath Baikal’s depths.