abandoned
affliction
below ground
blind alley
blind pass
blind room
calamity
catacombs
cave
claustrophobia
collapse
corridor
crash
dark
dead end
dead place
deep
digging
disaster
distress
downfall
earth
end
fall
geological
geology
gloomy
hole
meltdown
mining
misery
nature
obstacle
old
speleology
spooky
stone
switch back
switchback
tail track
travel locations
tribulation
tunnel
tunneling
turnout
underground
unhappiness
wall
woe