The Mole People (1956) on Netflix

So it starts out with an archaeological team in the 50's that stumbles upon this underground civilization of a lost dynasty of sumerians, who have apparently failed to evolve over the past 5,000 years. The plot becomes a but fuzzy here, but pretty much only three people survive. The albinos decide to sacrifice these three survivors, but they escape. One of them dies, but the other two (Dr. Bentley and Dr. Belamin) escape by shining a flash light in the albinos and mole people's faces. Wait- who are these mole people? They are mutant humanoid mole-type creatures that are the mistreated slaves of the albinos and resemble the sand people from Star Wars. Just like the albinos, living underground has made them highly sensitive to light. Anyways, the sumerian priest believes that the flashlight is the sacred fire of their goddess, Ishtar. They come to believe that Bentley and Belamin are messengers of Ishtar. They give Bentley a slave, a beautiful woman named Adad who is shunned by the albinos because of her tan skin. Of course, she and Bentley fall in love and he says she can come with him if they ever get out.