Hot forming the ITER vacuum vessel 

That may be oil or even liquid salt or metal.

I believe that is oil putting hot metal into water temperature shocks it and cussing it to break

It's like when you have a skillet so hot that water just beads up and rolls around, rather than wetting it. A layer of vapor forms between the liquid and the hot object, insulating it. This is called the Leidenfrost effect - en.wikipedia.org/wiki/Leidenfrost_effect

I'm going with 'it's not water', though I'm surprised there's no flame if it's oil. I also don't think it's liquid salt, that stuff is HOT, you'd see some effect of that heat in the video, like the heat haze off of a road. So I'm going with some sort of oil, that has a flash point obviously higher that what this metal has been heated to. Would be nice to understand the requirement for the quench however as well, what sort of hardening they are going for, and how this affects their dimensional stability.

@@4wdguydrivesby I'm quite certain it is water; it does not look like oil, and oil is likely to produce flames. Liquid salts and metals tend to be very reactive, and I've never heard of them used for quench. Not to mention the safety concerns with a very hot liquid. If an oil had a flash point hotter than red hot metal, that implies the oil could be red hot and not burn (i.e. color temperature)... seems implausible. Not sure why everyone thinks water quench is bad - water quench is used in some applications, oil quench in others. See wikipedia - or that video website... what's it called again, ootube? ;)

There are tools whose purpose is to make other tools.

Why was it terrible

Safety speeds

Yeah I'm sure they could build a gigantic fusion reactor faster if they touch that glowing shit with their bare hands or whatever.