Tunnel boring machine drilling a live rock tunnel.
Schlüsselwörter
mole,
excavate,
tunnel,
boring,
bore,
construction,
drilling,
dirtied,
rock,
stone,
hole,
rotary,
penetration,
gyro,
structure,
engineering,
geology,
installation,
head,
teeth,
burrowing,
underground,
subway,
mining,
header,
cutting,
shred,
technology,
dig,
burrow,
digging,
burrowing,
sinking,
perforation,
metal,
closeup
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