Book excerpt: This report describes the equipment, methods, and costs that are considered applicable for underground emplacement construction of nuclear explosives such as would be used in nuclear excavation. The test of the report discusses the available methods and techniques currently being used in 'big hole' (30-inch diameter and larger) drilling, tunneling, and conventional shafting. The technical data have been collected from the available literature as well as by personal contacts with the Government agencies and private industries concerned. (Author).