Construction of a tunnel of a high-speed railway line. Construction of a large tunnel in the mountain
Palabras clave
underground,
construction,
tunnel,
industry,
work,
dark,
men at work,
subway,
industrial,
transport,
railway,
subway,
under,
building,
concrete,
road,
technology,
construction site,
builder,
line,
urban,
engineering,
machine,
equipment,
engineer,
dust,
highway,
train,
architecture,
heavy,
background,
ventilation,
safety,
pipe,
depth,
modern,
danger,
large,
fitting,
speed,
europa