This is the technology of the breakaway civilizations and the secret projects.
“‘Yes. Once in the not-so-distant-past, but yet many generations before the coming of the Spanish, a Paiute chief lost his bride by sudden death. In his great and overwhelming grief, he thought of the Hav-musuvs and their long tube-of-death. He wished to join her, so he bid farewell to his sorrowing people and set off to find the Hav-musuvs. None appeared until the chief began to climb the almost unscaleable Panamints. Then one of the men in white appeared suddenly before him with the long tube, and motioned him back. The chief made signs that he wished to die, and came on. The man in white made a long singing whistle and other Hav-musuvs appeared. They spoke together in a strange tongue and then regarded the chief thought- fully. Finally they made signs to him making him understand that they would take him with them.
“‘Many weeks after his people had mourned him for dead, the Paiute chief came back to his camp. He had been in the giant underground valley of the Hav-musuvs, he said, where white lights which burn night and day and never go out, or need any fuel, lit an ancient city of marble beauty. There he learned the language and the history of the mysterious people, giving them in turn the language and legends of the Paiutes. He said that he would have liked to remain there forever in the peace and beauty of their life, but they bade him return and use his new knowledge for his people.’