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Tunnel boring.
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Previously:
1952 subway tunnel cleaning machine - photo
Constructing a tunnel under a highway - GIF
Drilling a tunnel with a hole saw - GIF
How tunnels are dug - GIF
Japanese maple tunnel - GIF
You don't get a sense of scale on this, what is the diameter?
TBMs breaking through is surprisingly underwhelming given how amazing the technology is. It's not there, a bit of rock crumbles, then there's a giant drill in a perfectly-round hole. It's still cool to watch and to hear.
Neil
Judging by the small number of cutters wheels This TBM is probably boring either a tunnel for water or sewer or a service tunnel for conduit and air circulation between a pair of much larger tunnels. so probably as small as 9 feet to as large as 12 feet.