Regardless of technical progress no overunity device has ever worked. You are correct that if an unseen source could be fed in then we could have a source of power greater than the nominal input. However no such source has ever been proven to exist with nuclear energy being the last new source found. This idea that empty space or the vacuum is a source is nonsense. Massive amounts of research has been conducted into overunity devices but sadly none have worked and i don't see this changing, ever.
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