Tunnel construction

thumb|Early cement gun, Sydney 1914 thumb|A building worker spraying shotcrete on welded wire mesh thumb|Shotcrete nozzle with 75 Millimetre|mm concrete hose from line pump and 20 mm [[compressed air line]] thumb|Shotcrete swimming pool under construction in [[Northern Australia]] thumb|A 76 mm borehole in fibre-reinforced shotcrete on a tunnel wall thumb|A shotcrete curvelinear wall at the Museum of the History of Polish Jews in [[Warsaw, Poland]] right|thumb|Shotcrete-stabilized cliff above a [[motorway in New Zealand]] Shotcrete, gunite (), or sprayed concrete is concrete or morta

popular method of modern tunnel design and construction

undersea tunnel composed of sunken linked prefabricated segments

controlled use of explosives to break rock for excavation

use of tunnels for military operations in the Gaza Strip

tunnel in Palestine and Egypt

Microtunneling or microtunnelling is a tunnel construction technique used to construct utility tunnels from approximately in diameter. Because of their small diameter, it is not possible to have an operator driving the tunneling machine, so they have to be remotely operated. thumb|Micro tunnel boring

the construction method for building a tunnel

quality of core recovered from a borehole

Long anchor bolt, for stabilizing rock excavations

type of underground construction

underground vertical or inclined passageway in civil engineering

300px|thumb|Trebelev subterrene (Soviet Union) A subterrene (, ) is a vehicle that travels underground (through solid rock or soil) much as a submarine travels underwater, either by mechanical drilling, or by melting its way forward. Subterrenes existed first in fiction as mechanical drillers, with real-world thermal designs and examples following in the second half of the 20th century.