If there are enough people interested in tunnels who want to read about them, here's a book for them to read. But I can't see much general interest in the subject. It is a detailed and serious study of man's underground activities since the Babylonians constructed a tunnel under the Euphrates. Some of these prehistoric tunnels would be engineering feats today. The Roman remains have some of them recently come to light and been incorporated into modern aqueducts. The Dark Ages intervened -- then tunneling again came into prominence. And with railroads, tunnels became essential. Developments, inventions, specific discussion of dozens of tunnels in detail, the problems met, the difficulties overcome. The great modern tunnels are described and proposed tunnels outlined.