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Obviously a quarry. How else could you explain the huge depth markers visible in the top photograph?
This is idiotic. It was clearly done by aliens.
Qarries are the same as trenches apparently. Sea floor spreading and layers of basalt rock and centuries of expansion... clearly that's the conspiracy.
Apparently the deepest quarry is 1.2 km (1200m) while the deepest trench, the Mariana trench, is 200 km deep (200,000 m). Totally the same in scale /s
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