Most of us have heard of Area 51, where top‑secret “flying saucers” are reportedly stored, and some claim live extraterrestrials were spotted there. Yet there’s a whole shadowy roster of lesser‑known, off‑limits sites that supposedly house equally dramatic projects. By definition, these secret installations are never openly acknowledged; officially they “don’t exist,” or their real activities differ wildly from the official story. In this roundup of the 10 alleged top secret bases, we’ll dive into each claim, layer by layer, and see just how wild the rumors get.
10 Alleged Top Secret Bases Overview
10. Base AL/499
Most of what we “know” about Base AL/499, said to sit about 60 metres (200 ft) beneath the quiet English hamlet of Peasemore in Berkshire, comes from a whistle‑blower named James Casbolt. Casbolt alleges his family boasts high‑ranking intelligence contacts and ties to the Illuminati, which allegedly placed him at birth into a covert program operating out of the underground complex, dubbed Project Mannequin.
According to his account, Project Mannequin’s primary focus is a cloning venture aimed at producing super‑soldiers, while a parallel MKULTRA‑style mind‑control stream creates highly trained assassins who are unaware even of their own missions. Though based in the United Kingdom, the operation supposedly links to similar clandestine projects in the United States, ultimately answering to the NSA.
Casbolt further claims that, while his entry was facilitated by family connections—he even says he was part of an Illuminati‑run assassination squad—many others were abducted and forced into the program as unwitting “civilian guinea pigs.”
9. Camp 13
In a recent deep‑dive on recovered alien craft, we explored the so‑called Kalahari Incident, where a downed UFO was allegedly seized by the South African military, complete with two extraterrestrials, before being handed over to U.S. partners. The story adds a twist: a third alien being was supposedly retained by South Africa and taken to a secretive base.
If there’s any grain of truth, the hidden installation that housed this third being may have been just as critical to the South African forces as the wrecked craft itself. Camp 13 is rumored to lie somewhere within the vast Kalahari Desert, though its exact coordinates remain classified. Beyond housing an alien detainee, the base is said to be a testing ground for high‑tech laser weaponry.
UFO researchers based in South Africa argue that sightings far outnumber official reports, and whispers of other similar facilities abound across the desert landscape.
8. Top Secret UFO Response Team Based In Wales
Journalist Derrick Gough contends that, as early as the 1980s, the United Kingdom and United States jointly operated a covert program out of a base tucked in Wales’s Brecon Beacons mountains. This unit allegedly focused on retrieving mutilated human bodies that had been abducted and experimented upon by alien forces.
Gough says he received startling files from a military whistle‑blower, only to endure threatening phone calls and a mysterious fire at his office after attempting to involve the police. He passed the documents to UFO investigator Tony Dodd, who later chronicled the story in his 1999 volume Alien Investigations.
Dodd’s further research suggests the Welsh site was a top‑secret UK/US venture launched under Thatcher and Reagan. The response team was on call around the clock, receiving prior alerts of incoming UFOs and their grim cargo. Their duties spanned recovering the bodies, concealing them from public view, and sealing off operational zones to keep prying eyes at bay.
7. Alien Base Off The Icelandic Coast
UFO researcher Tony Dodd also reported a surge of extraterrestrial activity along Iceland’s shoreline, prompting speculation that a covert alien base operates there, apparently under the watchful (or perhaps unwitting) protection of NATO forces.
Dodd’s sources include members of the Icelandic fishing community—often the only civilian vessels allowed near U.S. and NATO ships—as well as an anonymous Navy insider. These informants described multiple UFOs entering the sea or skimming low over the rugged coastline. The naval source claimed his crew tracked the craft’s approach and ensured a clear passage to the destination, even joining a vessel for one such encounter.
Once the craft slipped into the water, it was monitored closely, while the surrounding waters were kept free of other traffic until the mysterious visitors safely arrived at their hidden base.
6. Network Of Bases Under Denver International Airport
Despite official denials, conspiracy circles have long argued that Denver International Airport conceals a sprawling subterranean complex. Since its opening in February 1995, theories have swirled about hidden tunnels, bizarre “Illuminati‑style” symbols, and a layout that feels deliberately disorienting.
The airport’s construction costs ballooned from roughly $1.7 billion to over $5 billion, and the original design was reportedly scrapped and buried, fueling speculation about secret undertakings below the tarmac.
Researcher Alex Christopher, alongside late whistle‑blower Phil Scheinder, claimed to have accessed the underground facility, describing “human slave labor” overseen by reptilian aliens who ostensibly control the U.S. military and government. They also alleged that the cavern houses experimental labs, production lines, and even a secure area reserved for global elites—including the British royal family—to use during the forthcoming “change.”
5. Secret Base Under Rendlesham Forest
While the 1980 December Rendlesham Forest UFO incident is fairly well‑known, fewer people are aware of the alleged underground complex that supposedly lies beneath the former U.S. bases at Woodbridge and Bentwaters.
Director Daniel Simpson, who filmed the 2014 horror movie The Rendlesham UFO Incident (also known as Hangar 10) on location, recounted speaking with a property owner who rented space on the now‑private land. When they set up an internet connection, the engineer discovered cables that appeared to date back to the early 1980s. Upon closer inspection, the engineer grew frustrated, noting that the technology seemed far more advanced than anything publicly available at that time.
Simpson also stumbled upon several mysterious hatches scattered throughout the forest. Heavy lids covered ladders that plunged into absolute darkness. Local authorities dismissed them as ordinary drainage systems, yet Simpson argued they looked “highly elaborate” for such a purpose, and locals later confirmed these openings still serve as access points to the secret underground installation. In 2011, files related to the incident mysteriously vanished from the National Archive, adding another layer of intrigue.
4. The Black Pyramid Of Alaska
Alaska’s harsh, unforgiving terrain hides what many claim is an ancient black pyramid buried deep beneath the ground—one of the most bizarre alleged secret sites on the planet.
The story first surfaced in 1992 when Channel 13 Anchorage aired a segment on scientists conducting seismic recordings who believed they’d inadvertently mapped a pyramid‑shaped structure roughly 80 km (50 mi) from Denali (formerly Mount McKinley). Nothing further emerged until 2012, when a retired military veteran contacted UFO journalist Linda Moulton Howe, revealing that the pyramid was thought to be millennia‑old and designed to tap into the Earth’s natural energy.
As Howe publicized the claim, additional witnesses stepped forward. Bruce L. Pearson asserted the structure was “not made by man” and served as a secret base for studying energy harnessing. Another anonymous source claimed his father helped install a powerful electrical system inside the “dark pyramid,” reinforcing the notion of a covert, technologically advanced facility.
3. The Protected Area Of The Ross Sea
In October 2016, an international treaty designated 1.5 million sq km of the Ross Sea as a protected zone, ostensibly to preserve wildlife by banning commercial fishing. On the surface, the move seemed environmentally sound.
However, conspiracy enthusiasts argue the protection is a cover‑up for secret bases operating beneath the icy waters. They claim alien forces reside there, engaged in clandestine wars with a covert multinational human response team.
When Google Earth images resurfaced showing a crashed UFO in Antarctica surrounded by mysterious vehicles—none leaving obvious track marks—researchers began to wonder whether the official rationale for sealing off the Ross Sea was truly about conservation, or something far more enigmatic.
2. Base 211
The Third Reich officially claimed that its 1938 Antarctic expedition aimed to secure Germany’s whaling interests. Conspiracy circles, however, contend the true purpose was to contact inner‑earth beings, culminating in the creation of Base 211.
Rumors abound that Adolf Hitler fled to this hidden base in the war’s final days, later escaping to South America and allegedly living there into the 1980s. Nazi high‑command allegedly believed an ancient alien race inhabited Antarctica and even propagated the notion that they themselves descended from these extraterrestrials.
1. The Claims Of Admiral Byrd
One of the earliest and most famous secret‑base allegations dates back to 1947, when Admiral Richard Byrd allegedly reported an encounter during a flight over the North Pole. He claimed to have discovered an entrance to an inner‑earth realm, leading to a lush, green landscape and a base inhabited by mysterious beings.
Byrd supposedly held a press conference to share his findings, warning listeners that the beings could travel from the South Pole to the North Pole at astonishing speeds. Shortly after, the U.S. military allegedly ordered him “hospitalized” and barred him from any further public briefings on the matter.
Byrd also claimed to have seen aircraft bearing swastikas, fueling speculation that Nazi forces had established Base 211 and secured a communication link with an inter‑terrestrial race capable of pole‑to‑pole travel.