“Could”
It COULD have Skittles mines.
better?
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https://www.ft.com/content/97f28b37-4ced-46ad-867f-b8108484d0c4
On Monday, researchers in the US revealed they had seen seismic signals indicating a water reservoir buried deep below the crust. In terms of volume, it is not so much a puddle but an infinity pool, enough to cover the entire planet with an ocean at least one kilometre deep.