"It's producing fragments of building stone, so it might be structural. We might be thinking of a small shrine or a chapel," says Dr Andy Seaman, from Cardiff University, who is leading the dig.
The penguins' feathers are "the most complicated and best insulating of any animal", he says. Over time they are damaged, so the penguins shed them annually.
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"Life in Technicolor" by Coldplay (Episode 1)
She says cheaper costs abroad to put on a festival could also be a factor, but feels the festival is moving because "he's on the form of his life" after his Grammy win and the release of his fourth studio album, Idols, last year.