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Except Day-night circle on some random alien planet may not be the same as on earth. For example take mercury. One year on Mercury has 88 days and one day-night-cycle lasts 2 Mercury years... Have been seeing this one quite a lo…
Like the Ideo of the bigger Sub in the original post. Especially the solar panels. The Solar Panels could only produce power in shallow water. Beneath a certain depth you would have to use conventional Power Cells with would get used …