Drilling a tunnel with a hole saw - GIF

Drilling a tunnel with a hole saw.

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Previously:

How tunnels are dug - GIF
Liebherr tunnel crawler excavator - GIF
Roadheader cutting tunnel - GIF
Tunnel blasting shockwave - GIF
Tunnel boring machine breaking through - GIF
Tunnel washing truck - videos
Zipper tunneling truck - GIF

Does anyone understand the symbols at 0:37?

Nevermind, answered my own question, it's a toolgifs watermark.