Delaware, Delaware Bay (Richard S. Shaver's Experiences)
Richard S. Shaver's accounts, popularized in Amazing Stories magazine from 1945-1950, describe encounters with subterranean factions called "dero" (malevolent beings) and "tero" (benevolent ones) in caverns beneath Detroit and later near Delaware Bay. Shaver claimed a hologram led him to a cave entrance on the east coast of Delaware Bay, where he entered via boat and visited a Tero city before an attack by Deros. He later received confusing "thought beams" that mixed occult elements, which some interpret as disinformation. Shaver's stories are often classified as "science faction" (blending fact and fiction), and he admitted to channeling voices, including one incident where editor Ray Palmer overheard multiple voices discussing a murder in the caves. No physical evidence of these caverns exists, but Shaver's tales inspired feedback from others claiming similar underground experiences, though many led to occult involvement or paranoia. Modern analyses suggest Shaver used the dero concept to process personal trauma, such as family tragedies. Personal accounts remain anecdotal, with Shaver's own as the primary source; some enthusiasts in Shavertron magazine report exploring potential cave sites but find no confirmation.

Egypt (General) - Miniature Robots Under Pyramids
Miniature robots have been used to explore hidden passages in Egyptian pyramids, aligning with the document's mention. In 2011, the Djedi robot discovered red hieroglyphs in a tiny chamber of the Great Pyramid, unseen for 4,500 years. Other robots, like those in 1993 and 2015, probed shafts and voids, revealing doors and markings but no alien tech. A 2018 proposal involved muon-scanning and tiny robots to investigate a mysterious void above the Grand Gallery. No evidence of chemical/biological weapons or vast alien-related complexes, but ongoing scans suggest undiscovered chambers. Personal experiences are limited to archaeologists' reports of excitement during explorations, with no supernatural claims substantiated.

Egypt, Alexandria - Ancient Underground City
Recent discoveries confirm an ancient sunken city off Alexandria, identified as Canopus (not fully underground but submerged). In August 2025, archaeologists retrieved 2,000-year-old statues, coins, pottery, and ship remnants from the Mediterranean, suggesting the city was larger than previously thought and used for rituals. Earlier finds include catacombs and chambers in the area, part of Thonis-Heracleion, a pre-Alexandria port city lost to earthquakes and subsidence. No evidence of active underground exploitation or alien involvement, but the site matches descriptions of vast ancient subterranean networks. Divers report eerie, preserved ruins, but no personal abduction or supernatural experiences noted.

Egypt, El Trina Gabel (Likely Tuna el-Gebel)
This appears to refer to Tuna el-Gebel, a Greco-Roman necropolis in Minya Governorate with tombs, catacombs, and underground galleries for animal mummies (e.g., ibises). Excavations since 1912 have revealed unexcavated tunnels and pottery in side passages. A guide in the 1980s mentioned a large shaft explored decades earlier, where explorers followed it for days without end due to lack of supplies. No confirmation of infinite tunnels or alien connections, but the site is a labyrinth of historical burials. Visitors describe well-lit tunnels and a sense of mystery, with some urban explorers sneaking into closed areas.

Egypt, Gizeh - Underground Chamber with Metallic Door and Alien Discs
Scans have revealed hidden voids and corridors in the Great Pyramid, including a 30-foot corridor in 2025 and potential chambers below ground. Fringe claims persist of a metallic door with sonic code leading to 30,000 recording discs of alien civilizations, allegedly photographed but stored at Kirtland AFB. However, mainstream archaeology debunks this; no discs or alien equipment found—only hieroglyphs and structural anomalies. Some conspiracy theorists link it to ancient aliens or pre-flood tech, but evidence is anecdotal from books like Val Valerian's. No verified personal experiences beyond explorer debates.

England, Cheshire - Salt Mines Caverns and Tunnels
Over 160-260 miles of tunnels exist in Winsford Mine (Meadow Bank), excavated for salt and now used for storage (e.g., National Archives). The vast, stable caverns (700 football pitches) include glittering pink chambers and are 500 feet underground. No alien or occult claims, but urban explorers note eerie stability and Bond-villain aesthetics. Personal accounts from tours describe awe at the scale.

England, Corsham - Underground City for Cold War
The Burlington Bunker (CGWHQ) is a 35-acre underground complex 120 feet below ground, built in the 1950s for 4,000 government officials in nuclear war. It includes a railway, hospital, and BBC studio; declassified in 2004 and once for sale. Now abandoned, it's linked to nearby quarries with 60 miles of roads. No alien rumors here, but conspiracy links to Rudloe Manor nearby. Explorers report eerie emptiness.

England, Hertford - Templar Tunnels Labyrinth
A network of secret tunnels under Hertford, possibly Templar-linked, includes connections to Hertford Castle dungeons. Discovered in 2004, they sparked Holy Grail rumors. Nearby Royston Cave (Hertfordshire) has Templar carvings, found in 1742. No full mapping, but theories tie to Masonic or pagan uses. Local reports of hidden entrances persist.

England, Hove (Sussex) - Underground Cave with Reptilian Hybrids
No credible evidence or personal accounts found for reptilian hybrids or abductions in Hove caves. Searches yielded zero relevant results.

England, Kent - Ancient Underground Structures
Kent has numerous sites: Chislehurst Caves (man-made chalk labyrinth, used as WWII shelters), Margate Shell Grotto (mysterious shell-lined passage), and deneholes (ancient shafts). Explorations reveal Napoleonic forts and wartime tunnels. No alien links, but folklore of hauntings. Urban explorers share stories of getting lost in mazes.

England, Liverpool - Underground Tunnels Maze
Williamson Tunnels are a 19th-century subterranean labyrinth under Edge Hill, purpose unknown (philanthropy? Armageddon prep?). Spanning streets, they're partially open for tours; volunteers continue excavations. No supernatural evidence, but mystery persists. Visitors report ghostly vibes in the brick chambers.

England, London - 7-Foot-Tall Creature in New Victoria Tube Line (1968)
No direct evidence; a 1968 newspaper report mentions workers seeing a 7-foot dark creature in the New Victoria line, but details are sparse. Unrelated to the 18th-century "London Monster." Tube maps show the line, but no modern sightings. Anecdotal at best.

England, London - Underground City
London's underground includes Roman ruins, Victorian sewers, and WWII bunkers like the Cabinet War Rooms. A "layered history" of subways, crypts, and lost rivers forms a de facto city beneath. No single "city," but vast networks. Explorers describe disused stations and hidden vaults.

England, Manchester - Abandoned Underground City Exploration
Victorian Arches and tunnels form an "underground city" for storage and WWII shelters. Urban explorers access via secret entrances, finding forgotten spaces. No aliens, but eerie noises reported. Personal videos show explorations.

England, Orkney - Underground Pagan Temple

Neolithic sites like Ness of Brodgar (5,000 years old) are vast temple complexes predating Stonehenge. Discoveries include altars and chambers; Mine Howe is an Iron Age underground structure. No modern pagan use, but archaeological awe. Excavators report "jaw-dropping" finds.

England, Peasemore - Underground Base with Greys, Reptilians, Hybrids
Fringe claims from Barry King describe a Peasemore base for mind control and alien experiments. Linked to Greenham Common UFOs. No evidence; tied to reptilian theories popularized by David Icke. Personal testimonies are unsubstantiated.

England, Staffordshire - Underground Rosicrucian Chamber (1770)
A 1770 laborer allegedly found a staircase to a machine-filled chamber with a robed figure who smashed a luminous sphere. Story from Hargrave Jennings' book, possibly mythic; no archaeological confirmation. Linked to Rosicrucian legends. No modern experiences.

England, Westminster - Grey Alien from Hole in Mountain (Betty Andreasson)
Betty Andreasson's abduction started in Massachusetts (1967), not Westminster, England. She described greys from a "hole in a mountain" in her youth (1950s), but location is unclear—possibly misattributed. Involves manipulation and cavern realms. Her hypnosis sessions provide detailed personal accounts.

England, Wiltshire County - Britain's Area 51
Rudloe Manor (near Corsham) is dubbed "Britain's Area 51" for UFO investigation rumors and underground tunnels. Declassified as RAF base; alien corpse claims unsubstantiated. Linked to crop circles and sightings. UFO hunters report restricted access.

England, Woolpit - Green Children from Cave/Subterranean Land
12th-century legend: Two green-skinned children emerged from a cave/pit, speaking unknown language, from "St. Martin's Land" (twilight underground world). They followed bells into the cave and ascended to surface. Boy died; girl integrated, married, lost green hue. Historical accounts from William of Newburgh; theories include malnutrition, folklore, or extraterrestrial origins. No modern personal experiences, but enduring myth.

England, Yorkshire - Underground Systems
Vast caves like Gaping Gill (largest chamber in Britain) and Standedge Tunnels (four parallel bores through Pennines). Three Counties System links counties via 100+ miles of tunnels. Explorations reveal prehistoric remains; no aliens. Cavers share thrilling descents.

Ecuador (Morona Santiago Province) - Tayos Caves Underground Complex
Juan Moricz claimed in 1969 discovering artificial tunnels with metallic library and alien artifacts. 1976 expedition (including Neil Armstrong) found natural formations, no library—debunked as hype from Erich von Däniken's Gold of the Gods. Shuar indigenous guard the cave; recent tours note oilbirds and vast chambers, but no evidence of ancient complex. Moricz likely prospected for gold. Explorers report natural wonders, not artifacts.

Ecuador, Cavernas de Anzu Forest Reserve - Giant Spiders Discovery
In 2023, eight new species of giant crab spiders (genus Priscula and Sadala) discovered in Anzu Reserve and Amazon. One orange specimen with long legs found at Tiputini Station. No connection to underground horrors; scientific finds. Researchers describe excitement at nocturnal hunts.

Europe (Northern) - Underground Abductions by Fairies/Elementals
Folklore abounds with fairy abductions, often of babies (changelings) or adults to fairyland via underground realms. Parallels to modern alien abductions: time loss, sexual elements, otherworldly beings. In Celtic/Irish tales, victims return changed or aged. No recent personal experiences, but historical accounts link to shamanic or psychological phenomena. Some modern interpretations see fairies as ur-aliens.