noun, noun or participle which takes 'suru', intransitive verb
tunnelling; excavation; drilling; boring
Technical term used in civil engineering and mining for advancing a tunnel or borehole. Often used with する to mean 'to tunnel through' or 'to drill'.
トンネルを掘進する工事が始まった。
The work to tunnel through the mountain has begun.
This machine can drill through hard bedrock.