Tentang training
Underground construction refers to the
construction of underground tunnels, shafts, chambers, and
passageways, it is also sometimes used to describe the portion of
traditional construction that takes place below grade.
Public Training
UNDERGROUND FACILITIES
Underground facility means any item which is buried or placed below ground for use in connection with the storage or conveyance of water or sewage, electronic, telephonic, or telegraphic communications or cable television, electric energy, or oil, gas, or other suostances.