Atlantis
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The top of the piilar:

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Two shots from within the crater, at 100 meters down and 300 meters down, respectively. At 100 meters down, there is still direct sunlight reasonably often because of the large diameter of the crater.

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The bottom of the crater shows much bounced light from above, children playing on the beaches, and massive amounts of structures on the pillar walls, as seen in the following sketch:

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A coloured detail:

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