Well imagine you take two boats next to each other. Both swim right?
Now you weld them together with two long sticks. Still swim right?
Then you place a platform on those sticks with a hole in the middle, and build a roof above them. Moonpool finished.
[Here is a drawing](https://de.m.wikipedia.org/wiki/Moonpool#/media/Datei%3AWaterline_moon_pool.png)
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