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... illed with water.

   But there are still some subs in operation, which is not normal.

  If you are a planetary civilization, if this civilization happens to be in a planet with oceans as its main body.

  When the technology tree lights up to a certain level, there will inevitably be a choice, outward or inward.

  Outward means exploring into outer space.

   Inwardly, there are two types, one is to dig out the planet and build an underground world, and the other ...

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