Three planes trapped in a South Pole spiral

I spotted three planes circling near the South Pole. I wonder if it’s a glitch.
They all took off from AT05, so it’s certainly on purpose.
But why this happens?

I guess it’s because of magnetic South Pole. I’ve joined them and all of a sudden my heading went from 180 to 270

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Don’t you worry, it’s just @787KsK grinding flight hours😂

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