Ursula Le Guin - The Stars Below

Guennar stepped back. It was as if a light went out, as his face went into shadow. “No,” he said. “They will burn out my eyes.”

“Leave him be,” said Per, and set the heavy ore-cart moving towards the shaft.

“Look where I told you,” Guennar said to Bran. “The mine is not dead. Look with your own eyes.”

“Aye. I’ll come with you and see. Good night!”

“Good night,” said the astronomer, and turned back to the side-tunnel as they went on. He carried no lamp or candle; they saw him one moment, darkness the nest.

In the morning he was not there to meet them. He did not come.

Bran and Hanno sought him, idly at first, then for one whole day. They went as far down as they dared, and came at last to the entrance of the caves, and entered, calling sometimes, though in the great caverns even they, miners all their lives, dared not call aloud because of the terror of the endless echoes in the dark.

“He has gone down,” Bran said. “Down farther. That’s what he said. Go farther, you must go farther, to find the light”

“There is no light,” Hanno whispered. “There was never light here. Not since the world’s creation.”

But Bran was an obstinate old man, with a literal and credulous mind; and Per listened to him. One day the two went to the place the astronomer had spoken of, where a great vein of hard light granite that cut down through the darker rock had been left untouched, fifty years ago, as barren stone. They re-timbered the roof of the old stope where the supports had weakened, and began to dig, not into the white rock but down, beside it; the astronomer had left a mark there, a kind of chart or symbol drawn with candle-black on the stone floor. They came on silver ore a foot down, beneath the shell of quartz; and under that—all eight of them working now—the striking picks laid bare the raw silver, the veins and branches and knots and nodes shining among broken crystals in the shattered rock, like stars and gatherings of stars, depth below depth without end, the light.