“The Invaders” also published as “Behind the Black nebula” by L. Ron Hubbard
Publication date: January 1942
Original publication: Astounding Science-Fiction
Genre: Science Fiction
Story description: Far into the future, a Science Corp technician makes a monumental discovery that saves the lives of men condemned to work in the Crystal Mines of the Black Nebular.
Currently available as part of the Stories from the Golden Age series, in the title Beyond All Weapons.