This is a unique video that shows how a blast is initiated and blasted in underground tunneling. The video also shows how the timing of the blast started in the center of the tunnel where the initial void is created (known as the cut) as it expands outwardly around the perimeter of the tunnels and finally to the bottom holes of the tunnel known as the lifters holes.
Without seeing the fragmentation of the blast, do you think this is a successful blast?
Source of video:
