Africa-Mawenzi-Hush.
Wingsuit on TOP of the cave at the start, then stop.
Snow tracks appear in front of you as the ghosts ride below.
I found it pretty interesting.

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Huh, that is pretty neat. I wonder if it works with any of the other tunnels in the game. I'm thinking not, cause it'd be easier to notice.
Why just Africa then

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I am thinking it has coded in for snow tracks to appear at length and width, but not height, because that would be incredibly hard to program, I am guessing.
You could probably see it on anywhere with two layers of snow.
Guess it was an oversight considering how the Dev team thought about mountains, and that you would always be at a certain level.
Still, this is all speculation, and I can't say anything until Batty shows up and clears this up.

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There could be a bit of a wait for this.

He's working on some stuff. You might have heard already.

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Only a numbskull thinks he knows things about things he knows nothing about.

Amy Archer