adit
antique
architecture
black
cave
cavern
coal
copper
corridor
dark
deep
dig
dirt
dirty
employment
end
energy
entrance
history
horror
illuminated
industrial
industry
job
labor
lamp
light
mine
miner
mineral
mining
mystery
nature
nobody
obsolete
old
safety
shaft
skill
solitude
soot
stone
subterranean
tunnel
tunneling
underground
wall
work