Supporting a tunnel roof.
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Previously:
1952 subway tunnel cleaning machine - photo
Constructing a tunnel under a highway - GIF
How tunnels are dug - GIF
Making a truck fit inside a low-clearance tunnel - GIF
Setting off a firecracker inside a tunnel - GIF
Tunnel blasting shockwave - GIF
Tunnel construction GIF
Tunneling and mining roadheader - GIF
Vintage tunnel boring machine - GIF
