**** S ****
Sachs, Margaret - THE UFO ENCYCLOPEDIA., Perigee Books., pp. 147-148: A section titled HOLLOW EARTH HYPOTHESIS presents a history and basic description of the 'Hollow Earth' theory.
Sanderson, Ivan T. - INVISIBLE RESIDENTS., Avon Books., New York, NY: Underwater civilizations of scientifically advanced beings who live beneath the surface of the oceans, and findings to support their existence.
Sergeant, Winthrop - THROUGH THE INTERSTELLAR LOOKING GLASS., Article in LIFE magazine., May 21, 1951: References to the 'Shaver Mystery'.
Sauders, Alex. (Also see: Wentworth, James - pseud.)
   --- HAUNTED CAVES., Article in SEARCH magazine., Oct. 1961: The legend of Buck Hill Caverns (Also see: Smith, Warren - INTO THE STRANGE)
   --- PROJECT MOHOLE., Article in SEARCH magazine., Nov. 1964., pp. 41-43: Plans for an off-shore drilling project to attempt to sink a shaft through the 'Mohorovicic Discontinuity' (or 'MOHO'), the layer of the earth separating the crust from the mantle. (Also see: Malakhov, A. & Bascom, Willard)
Saunders, St. George - SEVEN SLEEPERS: THE HIDDEN KINGDOM: References to Symme's theory of a 'hollow' earth.
Saville, Frank - BEYOND THE GREAT SOUTH WALL., 1901., 322 pp., Reprinted by HEALTH RESEARCH: "Inside the North Pole, Center of the Earth fantasy novel. Sundry graphic illustrations painted by Robert L. Mason.
Scaparra, Jack - LOST CONTINENTS BEYOND THE POLES., Article in SAGA magazine., Feb 1970.  References to the geo-concavitic or 'hollow' earth theory.
Schmeer, Bill - THE ENTOMBED MINERS' STAIRCASE TO HEAVEN., Chapter in STRANGE WORLD OF THE OCCULT, by the editors of FATE magazine (Also appeared in FATE magazine., March 1965 issue., pp. 28-37)., Paperback Library, New York, NY., 1970: A full account of the experiences of David Fellin and Henry Thorne while trapped in a Shappto, PA., coal mine in 1963. (Also see: Calais, Ronald A.)
Schwartzberg, Richard - THE EERIE WORLD BENEATH OUR CITY'S STREETS!., Article in BEYOND REALITY magazine., Oct. 1980: Several reports of 'animal-men' that have been discovered in hidden caverns and tunnels.
Scott, Ervin M. - Letter in SEARCH  magazine., July, 1964., pp. 84: Report of a woman's abduction by evil cavern dwellers through a hidden tunnel in the  cellar of an old abby in the north section of Boston, MA., and into caverns below. Some suggest, based on certain indicators, that this may be a reference to the First Church of Roxbury in north Boston, however this is not entirely certain. The report also refers to beings that live in caverns under the Salt Flats desert of Utah, who are apparently good-natured humans who are opposed to those beneath the city of Boston - who along with their  collaborators apparently invaded the subterran regions of Utah. Also refers to a tunnel entrance with stone steps leading into the earth, located near the bank of a certain river.
Scrymsour, Ella - THE PERFECT WORLD., Reprinted by HEALTH  RESEARCH., 391 pp.: A rare fantasy novel dealing with the Hollow Earth theory.
Seabrook, W. B. - ADVENTURES IN ARABIA., Chapt. 15 speaks of secret caverns under the temple-shrine at Sheik-Adi on Mt. Lalesh, near Baadri, Arabia, with a subterranean river which the Yezidee's believe flows from the miraculous of Zem-Zem in Mecca, under the desert and across all the country.
SEARCH magazine  - (See: Palmer, Raymond A. & Marjorie)
SECRETS - (See: Cox, Norma C.)
Seigmeister, Walter - See: Bernard, Raymond W. (pseud.)
Seaborn, Capt. Adam - SYMZONIA: A VOYAGE OF DISCOVERY., A 'Hollow Earth' novel published by the author, and with a title based on John Cleves Symmes theory of a Hollow Earth. 1920: Describes the author's alleged discovery of an inner world inhabited by a superior race.
Seneca, Lucius Anneaus (First century Roman philosopher) - QUESTIONS OF NATURE: Tells of men who "...forced their way into the caverns," and entered the bowels of the earth, "penetrating to the deepest hiding places," where they saw "great rushing rivers, and vast still lakes," a world where "the whole of nature was reversed... the land hung above their heads while winds whistled hollowly in the shadows... while in the depths, frightful rivers led nowhere into perpetual and alien night." (Also see: Courlander, Thomas A.)
Sequoyah, Chief - SPIRIT OF THE SERPENT GOD: Article in AMAZING STORIES magazine., June 1948: A large hidden cave in  southwest Oregon in which lies a vast hoard of treasure from an early native American tribe, the entrance to which, according to legend, is guarded by the 'spirit of the serpent god'. Also stories of prospectors who had terrifying encounters in the cave, and others who have entered and never emerged.
SERIA DOCUMENTAL DEL PERU - Peruvian newspaper (date uncertain): Describes an expedition that explorers from Lima university - accompanied by experienced speleologists - undertook in 1923. After entering a tunnel in Cuzco, Peru, and advancing underground towards the coast, they lost communication with their point of entry. After 12 days only one member of the expedition, almost starved, returned to the surface; but his report of a confusing underground labyrinth was so incredible that his colleagues declared him mad. Police prohibited entry into the mysterious passages and dynamited the entrance to prevent further 'loss of life'.
Shakespear, J. - FOLK-TALES OF THE LUSHAIS AND THEIR NEIGHBORS: Article in FOLK-LORE - A QUARTERLY REVIEW., Vol. 10, 1909. Legends of the tribes in Bengal and Burma that their ancestors emerged fro a subterranean world, the entrance to which is believed to be located in the Lhoosai country close to Vanhuilen's village of the Burdaiya tribe. A similar legend is found among the Naga and Kabuis tribes to the north.
SHAVER MYSTERY CLUB LETTERZINE: Shaver Mystery Club., Chicago, IL., First issue circa (ca.) 1950. Last issue - Vol. 3, No. 6: Each issue contained material about Richard S. Shaver and the 'Shaver Mystery', or his writings on a war between two underground civilizations... the evil Dero and the peaceful Tero.
SHAVER MYSTERY MAGAZINE, THE - The Shaver Mystery Club., Chicago, IL.,: The Shaver Mystery Club., Chicago, IL.  Issued Nos. 1-2, 1947; Nos. 3-7, 1948; Nos. 8-9, 1949 (Last Issue).Each issue contained letters from readers, stories by Richard S. Shaver, and discussions of the Shaver Mystery and related subjects. Reprints of all nine issues and an incomplete tenth issue are available from; http://www.shavertron.com )
Shaver, Richard S. - Wrote many articles and short novels for AMAZING STORIES and other science fiction-fact magazines during the controversial "Shaver Mystery" period (ca. 1945-1949), including his most famous short novel, 'I REMEMBER LEMURIA', which was re-written and expanded by editor Raymond A. Palmer from the original draft titled 'A WARNING TO FUTURE MAN'. This story, as well as later ones based on the same theme, tells the history of two underground races, the DERO (or DEtrimental RObots), of a very negative-evil nature, and their nemesis, the peaceful TERO. These subterranean races were allegedly descendants OR contemporaries of the 'Elder' ones who abandoned the surface of the Earth ages ago, and built underground cities. They later departed for the stars, leaving their underground abodes to be occupied by less sophisticated subterranean dwellers, who separated into two factions... those who served the D-Force (the force of decay, degeneration, etc.) and those who served the T-Force (the "creative" force, etc.). Shaver wrote many "scienti-fiction" stories, however only ONE he alleged actually occurred to him. This was when a woman's voice 'led' him to get a rowboat and get on Delaware Bay, and head toward a shore-side cliff where, hidden in the shadows and the foliage, he discovered a hidden crack in the cliff, just large enough for his rowboat to enter, and he then entered a long tunnel half-filled with water. Rowing through this for some time he came to a large cavern where the underground "Tero" people lived... however, while there, this particular "Tero" community was attacked, and most if not all of it's residents were killed by the "Deros"... however Shaver - if we are to believe his story - was able to escape in his boat, and returned to the seaside cliff-crevice where he originally entered the 'underground world'. He says he never again entered that cave.
SHAVERTRON Newsletter (See: Toronto, Richard - http://www.shavertron.com )
   --- Summer, 1980 issue., p. 9: A strange cave in the Guadeloupe Mts. of New Mexico, into which two men entered, traveling deep into the earth, and arriving at a large cavern where they witnessed an unusual ritual performed by strange dark-robed subterranean beings.
   --- Spring, 1981 (No. 7): Letter from an anonymous reader, telling of a letter which appeared in a certain issue of the Purdue University EXPONENT, from a student of the University in Lafayette, IN., stating that "There are men who walk the tunnels beneath Purdue," and maintaining that certain forms of related activity were spreading across campus.
Shepard, Leslie A. - ENCYCLOPEDIA OF OCCULTISM & PARAPSYCHOLOGY., Avon Books., NY.:Includes the following sections relating to the Inner Earth: AGHARTA - p. 8; HOLLOW EARTH - pp. 431-432; MOUNT SHASTA - p. 831; SHAVER MYSTERY - p. 831; SUBTERRANEAN CITIES -  pp. 889-890; SUBTERRANEAN CRYPTS AND TEMPLES - pp. 890-892.
Sheppard, J.M. - Article in AMERICAN WEEKLY., Feb. 1944: The writer's discovery a smooth shaft in the top of a mountain on the Equador-Columbian border, from which emerged a "mysterious man" who beckoned him away from the area.
Sherman, M. L., Co-author - See: Lyon, William P.
Shuttlewood, Arthur - THE FLYING SAUCERS., Sphere Books Ltd., London., 1976., Chapt. 2 - ENTERING THE TREASURES OF THE SNOW (esp. pp. 19-23): Inner Earth references.
Simmers, Cleve & Aileen - MOUNT SHASTA'S MYSTIC QUALITY. Article in the MEDFORD MAIL TRIBUNE., March 3, 1963: References to the legends and stories of Le-Murian descendant (or "NagaMayas") living beneath the surface of the 'extinct' volcano, Mt. Shasta, in northern California.
Simpson, Wayne D. - Letter in the SHAVER MYSTERY MAGAZINE., Vol. 1 - No. 2., 1947., pp. 28-29: Tells of the "Spillman Manuscript" written by C.J. Spillman (of Phoenix, AZ), who in 1912 discovered an entrance to an underground 'cavern city' near San Simon, Bolivia... and who, along with other adventurers, encountered a race of "Christ-like" beings who stood nearly 8 ft. tall, looked almost exactly alike, and claimed to be part of an exploration party who had colonized a distant planet. The whereabouts of the unpublished manuscript were unknown to Mr. Simpson.
Singer, Jon
   --- THE BRISTOL HUM. Article in UFO REVIEW., Issue No. 9: References to the Inner Earth Mystery, and various reports of underground cities, etc.
   --- REALITY OF THE UNDERGROUND WORLD., A two-part article in UFO REVIEW., Issues Nos. 10-11: Several  accounts concerning physical human life beneath the surface of the Earth.
Slate, B. Ann
   --- (co-authored by Alan Berry) - BIGFOOT., Bantom Books, NY., 1978., Chapt - THE COINCIDENCE FACTOR., pp. 141-148: Refers to 'Bigfoot', and strange noises from under the ground.
   --- CALIFORNIA'S TIME TUNNEL. Article in SAGA'S UFO ANNUAL., 1978: A friendly race of very ancient and intelligent humans called the "Old Ones", who colonized other star systems, and who live under the El Paso Mountains, near Randsburg, CA., and of some men who were exploring an old mine in the area when they "heard a rumbling beneath their feet as if there were a hollow in the mountain."
   --- GODS FROM INNER SPACE., Article in SAGA Magazine., Jan. 1975.
Sleigh, Bernard - THE GATES OF HORN., Aldine House., London., 1926., 244 pp., illus.: References to the subterranean realm.
Sloyan, Patrick J. - MOUNT WEATHER: LAST SHELTER FOR THE BUREAUCRACY. Article in THE PHILADELPHIA ENQUIRER., Dec. 10, 1978: A secret government-built underground city, totally self-sustaining, and built within the interior of Mount Weather, in the Blue Ridge mountains near Bluemont, VA., which is to be used by high officials in government and military as a refuge in the event of a nuclear war.
Smith, Michael G. - "SASQUATCH, YETI, 'EARTH GUARDIANS', ANCIENT AND PRESENT: 'THE OLD PEOPLE'"., Article in THE NEW ATLANTEAN JOURNAL., Sept. 1971: References to the 'Old Ones' who live under the surface of the earth.
Smith, Warren (pseud.) See: Norman, Eric.
Snell, Kenneth., Ed. - NEWSLETTER FOR THE HOLLOW EARTH SOCIETY., The Hollow Earth Society., Sydney, Australia. Several issues published.
Snyder, Al - NEWTON'S LAWS ARE FULL OF FLAWS. According to the author of this book, Sir. Issac Newton made errors in his gravitational equation. Snyder's calculations indicate that the earth is five times less dense than is derived from orthodox scientific computation. He states that this minimal density means that the earth "...could only be hollow." He also calculates that the moon and sun are also hollow, and that nature contains within itself a conservation of matter principle to prevent matter from being wasted unnecessarily. He calculates that the sun is only 574 times as dense as the earth and not 330,000 times. "This would explain the mystery of why the sun has 98.8% of the mass of the Solar system, but only 2% of its angular momentum." (Also see: McDonald, Dr. George)
Somadeva, Bhatta - THE KATHA SARIT SAGARA, OR OCEAN OF THE STREAMS OF STORY., New Delhi, India., 1968. Ten volumes of ancient East Indian lore. Vol. 6., pp. 108-109: A description of the seven subterranean worlds of PATALAS, an underground realm beneath India, which appears deceitfully benign outwardly, yet is a reptilian 'hell' within, according to other sources.
SOMETHING QUARE DOWN THE TUNNEL., Article in THE PEOPLE (British)., Dec. 1, 1968: Reports of  a strange 'phantom' creature, about7 ft. tall, seen by workers during the construction of London's NEW VICTORIA tube line.
SOME THINKERS INSIST THAT THE EARTH IS HOLLOW., Article in WEEKLY WORLD NEWS., Aug. 18, 1981: Refers to early proponents of the 'Hollow Earth' theory, including Cotton Mather, Edmund Halley, John Cleves Symmes, Marshall B Gardner, and Cyrus Teed (who influenced several high-ranking Nazi's with his "Koreshian" or "Hollow Universe" theories -- that the universe is a vast hollow sphere, however the surface of planet earth is also the surface of a great concave world-universe with the sun, stars, planets and moon also existing within the great 'hollow' -- so profoundly that Hitler was believed to have sent expeditions to prove or disprove Teed's theories.
South, Wilfred A.
   ---- Letter in THE HOLLOW HASSLE newsletter., Vol. 1, No. 10: The discoveries of ancient lost cities under Alaska, Canada, Turkey, Britain, and Europe... by a secret group of explorers, of which the writer was a member.
   --- Letter in THE HOLLOW HASSLE newsletter., Vol. 1, No. 12: Contains a diagram showing the theoretical makeup of the earth's interior.
SOVIET TESTS REVEAL THE 55-HOUR DAY! - Article in WEEKLY WORLD NEWS., April 6, 1982: Records the strange discoveries of Russian scientists who spent 71 days in one of the world's deepest caves, located in the Abkhazia mountains in the former Soviet Union. At a depth of eight miles, the scientists reported increased vitality, less fatigue, and a natural change from the normal 24-hour working-sleeping cycle to a 55-hour cycle.
SOVIET TREASURE CAVE - Article in FATE magazine., July 1958., p. 1: The Mata Tash cave in the Kalak-Tash Mountains in the Republic of Kirghizi, within which - according to legend - lies hidden a vast hoard of treasures left by a culture which flourished more than 2,000 years ago.
Spence, Lewis
   --- LABYRINTHS AND THEIR MEANING., Article in THE OCCULT REVIEW., Aug. 1927: References to legendary labyrinths such as those of Crocodilopolis, near Lake Moeris in Egypt; the Aurignacian caves in the Pyrenees and the Dordogne Mts.; at Niaux in the Ariege; and the 'endless' cavern of Gortyna, at the foot of Mt. Ida in Crete.
   --- THE OCCULT SCIENCE IN ATLANTIS., Rider & Co., London., pp. 87-88: Refers to the cavern of Querti in the island at Elephantine, which is surrounded by much tradition; and arcane traditions of a certain cavern which was the source of all the waters that circulated through the Atlantean dominions. Pp. 110-111: Describes the "Great Labyrinth of Atlantis" with its entrance near the city of Cercenes, Atlantis.
   --- THE PROBLEMS OF ATLANTIS., p. 95: Several South American tribes who claim that their ancestors took refuge in huge subterranean caves during a time in the ancient past when the world was scourged with fire, and later by a world-wide flood.
Spillman, C.J. - THE SPILLMAN MANUSCRIPT: Unpublished manuscript describing the author's visit to a subterranean city beneath Bolivia. (Also see: Simpson, Wayne D.)
Stacy-Judd, Robert - FROM UNDERNEATH., Article in THE VOICE OF ASTARA., May 1982: The travels of the famous explorer Robert Stacy-Judd, who, while exploring one of the Caves of Loltun in Yucatan, became lost, along with his party. They are rescued by an old man who comes from the interior  depths of the cavern, and lead them to safety. Local residents claim that the strange "hermit" is more than    
a thousand years old. Also refers to Dr. Earlyne's expedition to these caves.
Stark, Martha G. - Letter in INNER EARTH ENTRANCES (self-published manuscripts circulated among a limited numbers of 'Inner Earth' researchers, and which became the basis-foundation-inspiration for PROJECT REDBOOK -- https://www.angelfire.com/ut/branton/redbook1.html )., by Bruce Walton., Vol. 5: Refers to an entrance to "Pelleur's Kingdom" near Carlsbad & Lecheguilla Caverns in New Mexico. (Also see: Ballard, Guy - THE MAGIC PRESENCE)
Statler, Gene A. - Letter in SEARCH magazine., Oct. 1961., pp. 76-81: Concerning L. Taylor Hansen's discovery of a "black, polished shaft, leading down into the earth near Death Valley", and of Hansen's later disappearance and return 12 years later, and of his (or her, according to some?) refusal to tell anyone where he/or/she had been during the missing years. (Also see: Hansen, L. Taylor & Oga-Make)
Stauffer, Truman
   --- UNDERGROUND UTILIZATION., (edited by) 8 Vols.
Steele, Henry M.
   --- ADVENTURES WITH THE SPACE TRAVELERS - AND LESSONS TAUGHT… Unpublished manuscript telling of the author’s astral journey’s which he claims to have made as a child, to a subterranean city under Stonehenge, England… and also physical visits to the Earth’s ‘Hollow’ interior via ‘flying disc’, where he claims to have observed its cities, the inner sun, etc.  (Also referred to in an article by the same author which appeared in SHAVERTRON newsletter - < http://www.shavertron.com > - Spring, 1981 issue, titled: DERO’S CON HISTORY)
   --- Letter in SHAVERTRON newsletter… No. 3, p. 5., Steele claims to have learned from Dick Williams, an ex-CIA agent, of the government’s discovery of a cavern containing ancient machines, some of which they had learned to operate, including a ‘time travel’ device “…not at all like we think of H.G. Wells’ time machines… works different.”
   --- MILLION $$ CAVE ENTRANCE REVEALED BY STEELE - NO CHARGE., Letter-article in SHAVERTRON., No. 5: A story an Indian (Native American) man heard as a young child, from his grandmother, about a tunnel on the shore of a certain river in Texas which led far in to the earth, where exists an illuminated subterranean land inhabited by the ‘Old One’ - who occasionally make visits to the surface, but had little if any contact with the local tribes.
Steen, Irene M. - THE CAVERNS OF HELL: Article in SEARCH magazine., Aug. 1957., pp.46-47: Based on Ferdinand Ossendowski’s research on legends of the subterranean world of Agharti.
Steichart, Prof. J.A. - THE TEN LOST TRIBES., Article in FATE magazine., May 1949., pp.65-67: Presents the writers’ theories on the whereabouts of the Lost 9 ½ Tribes of Israel (excluding the tribes of Judah, Benjamin, and ‘half’ of the tribe of Levi); also mentions an old Chinese legend which tells of the Lost Tribes, saying that the day will come when they will be found again.
Steiger, Brad - ATLANTIS RISING., Dell Publishing Co., New York, NY., Chapt. - AN INNER EARTH EMPIRE OF MASTERS AND MONSTERS.
Steinberg, Gene., Ed. - CAVEAT EMPTOR., No longer published: Some issues carried Hollow/Inner Earth material.
Stenuit, Robert & Marc Jasinski - CAVES AND THE MARVELOUS WORLD BENEATH US: Describes an expedition which succeeded in partly opening the doors of the "fabulous grotto of Bou-ch'la in Morocco."
Stephens, J.C. - Letter in SEARCH magazine, April, 1958., p. 102: Concerning the "Plutonians" who in ancient times built colonies deep within the  earth. (Also see: Obruchev, V.A.)
Stevens, Lt. Col. Wendell C. - UFO: CONTACT FROM THE PLEIADES., A PRELIMINARY INVESTIGATIVE REPORT., UFO Photo Archives., Tucson, AZ., 1982., p. 79: Describes the sixth face-to-face contact between Eduard 'Billy' Meier and the extraterrestrial woman 'Semjase', and of the  confirmation that strange people - unknown to us - live in the hollow interiors of certain mountains and in caves beneath the earth's surface. They are of various types, some with blue skin, and others who often come to the surface and blend in with surface inhabitants, unknown as to their true origins.
Stewart, C. Nelson
   --- BULWER LYTTON., Article in MAN, MYTH & MAGIC., Marshal Cavendish Corp., NY., 1970., p. 1670: Mentions "The Vril Society" of Germany and the belief that a race of subterranean beings will one day emerge, as related in E. Bulwer Lytton's book, THE COMING RACE.
   --- SUBTERRANEAN RACE., Article in MAN, MYTH & MAGIC., 1970., pp. 2712-2713: Legends and  accounts of subterranean life, and of scientific evidence suggesting the existence of vast cavities within the  mantle of the earth.
Stone, Fred., Ed. - AUSTRALIAN SAUCER RECORD., Vol. 7, No. 1., 1961., 6 pp.: An article titles 'AN AMAZING STORY', concerning the 'polar entrances' to the geo-concavitic (hollow) earth.
Stoppel, Florence E. - Letter in AMAZING STORIES magazine., July 1947., pp. 172-173: Describes attempts to reach an underground city believe to exist beneath the surface of Los Angeles, CA. (Also see: Cleveland, Stanford M.)
Story, Ronald - THE SPACE-GODS REVEALED., Harper & Row., New York, NY., Chapt. 10: CAVES FILLED WITH GOLD: The discovery by Juan Moricz, of a gigantic tunnel system running under the surfaces of Ecuador and Peru. (Also see: Daniken, Eric Von - THE GOLD OF THE GODS)
STRANGE GREEN VALLEY - Article in FATE magazine., Feb. 1959., pp. 6-7: Two Canadian geologists reported the discovery of a beautiful green valley 10 miles long and two miles wide in the barren frozen lands near Bathurst inlet, at the southern tip of Coronation Gulf, inside the Arctic Circle, and possibly warmed by underground geothermal heat.
STRANGE PHENOMENA., Psychic Australian., Spit Junction., N.S.W., Australia: Contains some info on the inner/hollow earth.
Stranges, Dr. Frank E.
   --- THE HOLLOW EARTH MYSTERY., National Investigations Committee on Unidentified Flying Objects (N.I.C.U.F.O.)., Van Nuys, CA: Cassette tape.
   --- THE HOLLOW EARTH MYSTERY: YOUR PARADISE INSIDE THIS PLANET., National Investigations Committee on Unidentified Flying Objects (N.I.C.U.F.O.)., Van Nuys, CA: Cassette tape.
STRANGE TUNNEL, A., - Article in THE BRIDGEPORT POST., Bridgeport, CT., Sept. 30, 1972: The discovery of an ancient tunnel near Milford, CT., on Edgemont Road near Hubbell Place., and more than 200 feet long and made of stone dry masonry with a brick arch. (Also see: INFO JOURNAL)
Straus, Commander J. - Articles appearing in "O CRUZIERO", a Brazilian magazine: Presents Straus's theories concerning the subterranean origin of many of the 'Flying Saucers'. These articles inspired O.C. Huguenin's book, FROM THE SUBTERRANEAN WORLD TO THE SKY: FLYING SAUCERS.
Stringer, Sparks - Letter in AMAZING STORIES magazine., Nov. 1947., p. 173: Reveals a blueprint-draft of a huge, unexplored cavern system beneath the Kokoweek mountains adjacent to Death Valley, California. (Also see: Gesner, Charles H., & Clark, Howard D.)
Strumbough, Virginia - FAIRIES WERE REAL., Article in FATE magazine., Nov. 1957., pp. 83-90: Evidence that fairies, who are notorious for their subterranean existence, actually existed.
Summers, Montague - WITCHCRAFT AND BLACK MAGIC., Rider & Co., NY., 1946., Later reprints by Arrow Books., pp. 246-247: Describes two so-called "haunted mines" in Saxony, Germany.
Swanson, Virginia Louise - Letter to Bruce Walton referring to Devil's Hole, in the Death Valley National Monument, northeast of Death Valley Junction, CA.  Two boys entered the 'cave' several years ago and were never seen again. Navy scuba divers were lowered on cables and reported seeing a large underground river which roared up from far below. They could not estimate it's width because of a myriad of colonnades of black rock which it flowed through before plunging down an abyss. The cave was sealed shortly following the incident.
Swift, Dr. - (See: Ginner, Al)
Symmes, Americus Vespucious - THE SYMMES THEORY OF CONCENTRIC SPHERES., Bradley & Gilbert., Louisville, KY., 1878: Americus was the sone of John Cleves Symmes, known as one of the first persons of modern times to advance the theory of a hollow, concentrically-sphered, Earth, inhabited within. (Also see: McBride, James)
Symmes, John Cleves - HISTORY OF BUTLER COUNTY., 1852., pp. 171-173: Symmes' beliefs and teachings of an inhabited inner world, concentrically sphered (one hollow sphere within another., 5 in all - however earlier and later theorists, considering the improbable logistics of such a series of concentric spheres, theorized one hollow sphere with a central matter-energy orb' or 'sun' suspended in the center of the 'hollow').  Symmes was one in a series of relatively 'modern' theorists on the Hollow Earth, preceded in order of their appearance and work, by: Cotton Mather, Edmund Halley, Leonard Euler, and Sir John Leslie.  (Also see: McBride, James)
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Tarde, Gabriel - UNDERGROUND MAN., Hyperion Press, Inc., Westport, CT., 1905., 196 pp.: Novel based on the premise that mankind will have to escape to the earth's interior to survive a worldwide catastrophe in the future.
TATTLER, THE - by the editors of WEIRD STORIES., Illustrated Newspapers Ltd., London., pp. 54-58: Records the story of a mysterious "haunted cave" in Burma.
Taylor, Douglas - TALES AND LEGENDS OF THE DOMINICA CARIBS., Article in THE JOURNAL OF AMERICAN FOLKLORE., Vol. 65: The tradition of the Bataka tribe (Dominica, West Indies) of people who live in caverns beneath "Pegua Rock" on the Barakua Ridge, and a legend that they will not emerge to the surface until "the end of the world." Also mentions a nearby cave, entered through cliffs down at the ocean, which also plays an part in Baraka traditions.
Taylor, William Alexander - INTERMERE., 20th Century Pub. Co., Columbus, OH., 1901; Reprinted by HEALTH RESEARCH: After miraculously surviving a sea disaster, a man finds himself in a strange Inner World inhabited by a peaceful, highly advanced race of humans.
Taylor, Michael., Ed. - WONDER MAGAZINE., Vol. 3., No. 2., 1951., published in England: Special 'Shaver Mystery' issue.
Tiede, Tom - JOHN SYMMES' PROPOSITION THAT THE EARTH IS HOLLOW STILL HAS ITS SUPPORTERS., Article in THE HERALD., Provo, Utah., July 10., 1978; Reprinted in THE HOLLOW HASSLE newsletter., Feb. 1981: Discusses the Hollow Earthy theory, and early theorists.
Tomas, Andrew
   --- ON THE SHORES OF ENDLESS WORLDS., Contains a chapter about the Inner Earth and ancient tunnel systems beneath Asia. Also describes the underground cavern cities of the "Nagas" beneath India and elsewhere, a very cunning and evil race of "lizard people" apparently descended/mutated from ancient bi-ped saurians like the Veloci-Raptors that lived on the surface ages ago, yet went down underground where they continue their secret war against the human race. (Also see: Wilson, H.H.)
   --- SHAMBHALLA: OASIS OF LIGHT., Sphere Books Ltd., London, England: Inner Earth material, including descriptions of the subterranean kingdom of "Agharta" beneath Mongolia, with its capitol-city of "Shambhalla."
Tompkins, Peter
   --- MYSTERIES OF THE MEXICAN PYRAMIDS., Harper & Row., NY., 1976: Contains some information on ancient Mexican tunnel systems.
   --- SECRETS OF THE GREAT PYRAMID., pp. 268-269: Describes tunnels, vast catacombs, and even a subterranean city believed by some to exist deep beneath the Gizeh plateau in Egypt.
Toronto, Richard., Ed. - SHAVERTRON ( http://www.shavertron.com )., Quarterly: Includes articles, letters, editorials, and other features relating to the Shaver Mystery, the Inner Earth, ancient mysteries, and related topics.
Trainor, Joseph - Letter in FATE magazine., Jan. 1980: Refers to two separate incidents in China, of encounters with subterranean creatures. Reprinted in THE HOLLOW HASSLE newsletter., May, 1983. (Also see: Willoughby-Meade, G.)
Trench, Brinsley Le Poer (or, The Earl of Clancarty) - SECRETS OF THE AGES: UFO'S FROM INSIDE THE EARTH., Pinnacle Books., New York, NY., 1974., 217 pp., illus.: Recounts many of the legends, stories and theories concerning the interior of the earth and its inhabitants.
Triven, Dr. - HOLLOW EARTH CITIZENS., Letter/article in SAGA magazine (date uncertain): A Longview, WA man claims to be a citizen of the 'Hollow Earth', and is able to visit the surface world through a "proton reversal process." He also warns of the dangers of publishing articles on the 'Hollow Earth' such as on in the Feb. 1970 issue, because some of the entities that inhabit the inner earth, especially the cavernous regions, are not at all benevolent. (Also see: LOST CONTINENTS BEYOND THE POLES)
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UFO-NACHRICHTEN (Swedish UFO Publication) - July, 1970 issue: Article, HOLE AT THE POLES.
UFO REVIEW (See: Beckley, Timothy Green)
Uhey, Lee - JOURNEY TO THE UNKNOWN., Article in THE HOLLOW HASSLE newsletter., May 1982: The story of one man's frightening encounter with the subterranean world.