"They can hear the mules and pit-horses who live down here, transporting the dug earth and mud barrels to the ladder. When these creatures were lowered down the shaft by rope they had brayed madly, thinking they were being buried alive. Patrick and the others walk silently, remembering the teeth of the animals distinct, that screaming, the feet bound so they wouldn't slash out and break themselves, lowered forty feet down and remaining there until they died or the tunnel reached the selected mark under the lake."
In the Skin of a Lion, Michael Ondaatje