Mór Jókai,
Black Diamonds: A Novel
“ He waits patiently, until, with a sullen, gurgling sound, as if lamenting the necessity, the last current of water vanishes behind a projecting mass of coal. Then he hurriedly casts off his coat, his shoes, his stockings; he has nothing on but his shirt and trousers. He fastens round him a leather pocket, in which is a hammer and chisel; he takes his safety-lamp and fastens it to his belt; and, so equipped, he glides into one of the fissures in the black rock. He is following the vanishing stream. He is a courageous man to undertake such a task, for his way lies through the palace of death. ”
