NxtUp...Mars
Mystery of the Black Abyss
What's that black spot? It's a window onto an underground world. Cave entrance on the flank of Arsia Mons. Mars' dusty atmosphere scatters quite a bit of light around, so there is certainly light entering that cave hole and bouncing around the interior. But it seems that the cave is so big and so deep that almost none of the light that enters the cave comes out. It's deep, and it's big; the hole that we see really is just a skylight on a big subterranean room.
http://www.planetary.org/blog/article/00000984/
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