Inside a glass melting furnace - GIF

Inside a glass melting furnace.

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Previously:

50 tons of scrap metal poured into furnace - GIF
Electric casting furnace - video
Forklift foundry furnace explosion - GIF
Homemade induction furnace pouring iron - video
Loading device at Carrie Furnace - photo
Removing metal workpiece from furnace - GIF

I don't know what they are doing, other then removing frozen glass with concrete breaker and mini equipment to haul out the solidified mess.
So I'm just guessing something went wrong in the process equipment, like power failure, or switch box melt down. So to get the machinery going again, they have to remove the mess?

Float glass is a continuous process in a long kiln like this. Literally the glass floats on molten tin. I have no idea what this really is.

Mark