An Underground Hollow Earth Alien Realm?

An underground realm?

Location. Near Ixtaccihuatl Volcano, Mexico
Date: January 8 1930 Time: night
39-year old Margaret Rogers was an American drug addict living in Mexico City, unemployed, and living in misery and despair, she prayed to be freed of her enslavement. On this day, a sympathetic and kindly friend, Doc Kelmer of the Electro Therapy Institute, took her in hand. As he had on other occasions, he gave her some money for food, clothing, hotel, etc. Later the following night, he met her, and in his car drove her past the city limits on the road to Cuernavaca. When Margaret became violently sick, he gave her a small vial to drink. She did so, falling asleep immediately.
Still later, upon awakening in a motionless car, she found herself in mountainous country lit by a brightly shining moon. The car was close to a mass of greenery that grew at the foot of a tall cliff. Margaret thought the spot was near Ixtaccihuatl Volcano. Doc Kelmer stood quietly touching the foliage. Once more Margaret was overcome by nausea. After the attack, Doc came to her side, talked briefly, and returned to the foliage. With upraised arms, he wailed (rather than spoke) a few words. Then a startling thing happened. The whole mass of greenery slid to one side revealing a large opening. Margaret followed the middle-aged man inside, oddly unafraid. The opening closed, and a queer bluish light filled the cave. Events moved swiftly then. But to Margaret it was all so vague. As though ordered, she made for a large block of black marble beside one of the cave’s walls, and lay down upon it.
She felt herself float above cool, green waters, watching strangely colored denizens at play, unable to descend for quite some time. She finally submerged beneath the water. The sensation of drowning was never felt. Then—-utter oblivion. Once or twice, as in a dream, she saw that she was in a vast room, lying on a table of some sort. Man giant figures surrounded her. Under a soft, lavender light, Margaret felt heavenly relief from the pains she had known for so long. Again came the feeling of floating. And, again, came the hazy realization that she lay unclothed on a table with one of the giants bending over her. When fully awake, Margaret thought for a moment that death had truly claimed her. In wonder, as she lay in a fur-covered bed fifteen feet long and nine feet wide, she looked about the room in which she was present, a spacious room with appropriately huge furniture where everything was seemingly made of silvery metal. Now free of pain, feeling clean (and weak), Margaret was given a jolt when she received a visitor in the person of a strangely attired female giant, strikingly beautiful. Given food and told the date—January 15 1930—as well as the fact that she had for days been taking the “cure,” Margaret learned that she had not dreamed of the giant figures about her when she had arrived in the caverns. For later she met those very same giants (or surgeons, to give them their proper name) who had cured her of the drug habit and its ruinous results to her system. Margaret Rogers saw many amazing things; learned much, met many of the cavern people who were all very kind to her. She noticed numerous articles of surface manufacture; examined wondrous machines of the underworld; saw evidence of how a badly hurt surface man, with one eye blinded for fifteen years, was made completely well again in two hours by the miraculous science of the wise people below.
Reduced to our size scientifically, Margaret was told that many cavern people live on the surface in large numbers, being scientists, doctors, lawyers, judges, even higher in the government. Days passed. Babies were seen as big as ten-year old surface children. Cavern children of that age were noted to be Margaret’s height of five-feet five. Method of locomotion in the underworld was a vehicle that was wheel-less and without motors, torpedo-shaped and two-seated. In what manner were they propelled over the perfectly smooth roads? Simply by—thought! About 2,000 miles was covered in less than two hours on one occasion. She learned further that the caverns are visited by Venusians in space ships, for the people below have colonies all over the universe. All the stars and planets as larger as Earth or larger, have life in humanoid form. None of this four-legged, green-colored intelligence so popular in science fiction. Animals on the other hand, are more varied. The “true” story of Jesus Christ, told to Margaret, would enrage any devout Christian of the surface world. More time passed for Margaret Rogers. For her it was a happy period. Horror and fear never once marred the scene. Therefore, she was obviously in the company of the “Tero” at all times. Never the “Dero”. According to Margaret certain underworld territory was forbidden, Margaret never had the reason explained to her. Before leaving for her return to the surface, she was told she would come back to the caverns in twenty years.
Margaret Rogers disappeared strangely and appeared just as strangely after three years. She died of a stroke in 1955 at the age of 64.

HC addendum
Source: Jim Wentworth, “Search Magazine, August 1958”