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Discussion on question by Mindwin: A 40km diameter alien saucer is floating 2km above the ocean for a long time. What are the effects on the sea ecosytem below?

Imported from a comment discussion on worldbuilding.stackexchange.com/questions/99987/…

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Discussion on question by Mindwin: A 40km diameter alien saucer is floating 2km above the ocean for a long time. What are the effects on the sea ecosytem below?