"We don't know where they go, but they disappear for about 10 days, and then they'll come back again. And without the CCTV, we never knew that."
It's taken from the inside of the furnace, and shows plasma - gas heated to about 1,000C - glowing brightly.
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Staying competitive is "not just about being competitive with one another, it's being competitive with short-form video and that's sort of the direction you'll see them going towards," Harrington says.