Sorry, don't know how to capture stills from video.
Please watch this video from 06:50 until 08:00.
Please tell me, in exact detail, how they managed to cut that square out of the solid rock face.
Also, please explain to me, in exact detail, how the cross hatched furrows shown at 07:45 were made.
And don't forget to watch the rest of the video for some amazing stuff.
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