As we saw last week, shipping containers carry our manufactured goods all around the world. There are some 17 million of them in existence, and that number will never shrink; no one can make a profit recycling shipping containers, because it takes a lot of energy to melt 8,000 pounds of steel down. So once brought into existence, these sturdy, hulking boxes are here to stay.

A portion of you are undoubtedly curious as to how they transform raw rolls of sheet metal into shipping containers. Well, here's how, as documented by Canadian company Big Box Steel. Pretty cool to see all of the jigs, rigs and fixtures, like the horizontally and vertically sliding chairs the welders sit in:

Now having seen the vid, what do you reckon is the worst job in that manufacturing squad? I think that guy at 8:12 who has to do the underside waterproofing has got it the worst.