[GeronL]

maybe it broke through to a cave underneath? There are known to be lavatube-type caves all around Olympus Mons after all

[SunkenCiv]

Thanks GeronL. The impact that caused the crater produced enough heat to melt / evaporate the chunk of ice under that part of the Martian surface, leaving only the hole. It's too bad we can't all go ATV-ing across Mars, really. :')

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