I started the video where the action heats up. We see a man loading bread into an "automated machine. (I wonder if he ever is tempted to press the jolly, candy like button on the control panel?)
The bread is separated into individual slices and melted butter is deposited on each slice, followed by mayo. Then it's on to the cheese depositing phase, which is a manual operation. We get to see workers load "logs of ham" onto a slicer. (Get a load of the spring constant on that ham log!)
And so on. By the end, you'd be forgiven if you never want to eat a sandwich ever again.