A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
A tunnel drill jumbo is a machine used to drill holes in rocks for setting blasting powder at tunnel construction sites. Our highly-evaluated tunnel drill jumbos have been used at a number of dam, underground power station and underground oil storage station construction sites as well as road and rail tunnel construction sites in the mountains.
Surface mining is a form of mining in which the soil and the rock covering the mineral deposits are removed. It is the other way of underground mining, in which the overlying rock is left behind, and the required mineral deposits are removed through shafts or tunnels.