She wrote an unpublished manuscript that told her story of the alleged visit to the Underworld.
Maggie was a Heroin addict that moved to Mexico in 1937 after finding that heroin was cheap.and easy to find there.
At one point she started praying for a relief from this drug addiction and her prayer was answered.
She was taken in an underground place where she lived for a while. She was healed from her addiction by people that lived in a cavern undergrounds city.
She met there tall beings that spoke Spanish and English but used a disk in front of their lips when they spoke because their frequency of the voice was too strong and was hurting Mary's ears when they took it off. She was healed in few weeks but stayed longer to learn about their customs and talk about them when se returned to the surface.
She found that Mira the person she was taking care of her and Mira's people work 24 hours per day.
They have technology that rejuvenate people's and some people that come underground are invited to join them and live underground.
They call themselves Nephli.
Mira got married while Maggie was living in the underground city. Her husband used to live on the surface and decided to go underground got rejuvenated and got married.
Nephli people have vehicles withouth motor and without whells. They use energy healing technologies.
According to Mira many of the Nephli live on the surface. Many of them are scientists engineers doctors lawyers, judges.
The Nephli are masters of reducing rays as well as the enlarging rays so they appear smaller althat their actual size to the people on the surface.
These men are sent to the surface to search for this who have even a small strain of Nephli blood in their veins to acquaint them of their heritage and to aid them.
During her stay in the underground city Maggie visited the houses of different people's. Their tables were made of stones. Large blocks of marble spread with soft four served them as beds.
Those who had more than one child had 8 or 10 rooms. At infancy the children of Nephli were walking and they were tall.
Maggie met on bearded man and was told that he came from Venus. She found out that Nephli have colonies all over the known and unknown universes without the knowledge of the surface people .
They have holographic technologies that show the history of the human race.
This type of technology is similar to the one Radu Cinamar wrote about being in existence in Bucegi Mountains under Romanian Sphinx.
Bibliography Hiding in the Dark Indrid Cold's Secrets of the Hollow Earth by Indrid Cold