"There is absolutely nothing visible inside that hole. It's black black black black black. HiRISE is a very sensitive instrument, and 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 none comes out."
This totally reminds me of the 'moholes' mentioned in Kim Stanley Robinson's Mars trilogy! How cool it would be to send explorers to these locations some day.
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