As Hoosiersmoker indicated, it looks like 4 clips from different job sites. However, I disagree with hemmjo's view, that concrete blades are inherently safe. A perfectly smooth disk, can grab loose clothing especially hair and ruin your whole day. Concrete saws have just enough bite to most assuredly grab hair and fabrics and wrap you up in and around it. I doubt you'd survive many mistakes.
On another note, that appears to be a particularly fine aggregate and hard concrete/sand mix. Coring companies I've had occasion to rub elbows with are able to knock out some pretty big openings, in concrete walls, withing a day. Bank vault coring is generally smaller in size, but much thicker and very hard, reinforced, concrete. But can likewise take a day, on average. The biggest delay, is probably figuring out who gets to pay, for getting locked out of the vault. :lol:

