The most common way tunnel in the rocky terrain of the blasting ex­plosives. Tunnel drilling holes in the rock. usually during the process of grinding. blast. Tkhlylh materials and installation is retaining. Design. spac­ing and hole practice. and how much money they invest and Blasting, the ultimate goal of a team of specialists capable of taking advantage of the technology are among the activities of the company with its record in this area was able several projects in the worst terrain to finish.