cave
cellar
chemical
concept
concrete
danger work
dangerous employment
dangerous job
dark
depth
destroyer
destruction
digger
dirty
dome
draining
drilling
dusty path
ecology
energy
engineering
environment
equipment
extraction
geology
grunge
hard work
heavy industtry
historical underground
hole
human
industry
interior
lamp
long wall
men
mine property
miner
mineral
movable
power
processed
production
profession
rock
safety equipment
technological way
underground tunnel
workers
workings
定額
Hunched worker in a blue overall and a safety helmet work in underground tunnel. Dangerous employment. The miner in the underground dome. The staff check the underground unsupported mine.の素材 [FY310100271758]
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