Large chemical explosive charges are being used in multiple charge designs in a variety of media and topographic situations to achieve actual construction projects. This program is being conducted with the realization that solving the engineering problems associated with using large point charges to achieve project objectives is a first major step toward the eventual acceptance of the use of nuclear explosives as these point charges. The target is the development of chemical and nuclear explosive excavation as accepted cost competitive construction techniques. Projects conducted in this new approach are TUGBOAT, a small boat harbor in a coral medium at Kawaihae, Hawaii, and most recently TRINIDAD, a series of tests and railroad cuts in a sandstone and shale medium at Trinidad, Colorado. A cost analysis of these latest projects when combined with earlier experience shows a unit cost reduction trend for chemical explosive excavation compared to a unit cost increasing trend for excavation by conventional means.