There are dangers from falls of rock and earth, which may cause immediate death, or enclose their victims in a living tomb. There are dangers from water, which may enter suddenly, flood the mine, and drown all who cannot reach the opening in time to escape. There are dangers from the atmosphere, which may become foul, and leave him who breathes it lying dead, far away from those who would gladly assist him, but would lose their lives should they go to his rescue. His light grows dim, and warns him of his peril; as he starts for a place of safety the light goes out, and in blackest darkness he falls and dies, unless speedily rescued. There are dangers from fire, where the atmosphere becomes charged with inflammable gas; it is lighted by an accident, and an explosion follows, in which dozens and sometimes hundreds of men are killed. There are dangers from fire outside the mine, as in the horrible affair of Avondale. There are dangers from the breaking of ropes, and the derangement of machinery, from the carelessness of those whose duty it is to exercise the utmost caution, and from other causes to be hereafter enumerated. And yet with all these perils there is no lack of men ready to meet them, as there is no lack of men ready to meet the perils and dangers of all branches of industry. Laborers can always be found for any honest employment, and too often for employment quite outside the bounds of honesty.
The earliest life underground was in caves of natural formation. All over the globe there are caverns where men have lived, sometimes under concealment, sometimes for sanitary reasons, and sometimes because they saved the labor of constructing houses. Some of these caverns are of great dimensions, and could furnish shelter for thousands of men, while others are adapted to the wants of only a few persons. Many caverns and caves are not available as dwelling-places, but are visited only from motives of curiosity on the part of travellers, or from a desire for gain on the part of those who seek whatever may be valuable. Many caves have histories romantic or tragic, and some of them combine romance and tragedy in about equal proportions. Tales of love and war, of fidelity and treachery, and of all the contending passions and experiences of human nature, can be found in the histories of these excavations which have been made by no mortal hands.