And that cheese-eating surrender monkey guy, Verne Something.
I'm not sure what you intend to imply. Jules Verne's work was mostly real life edutainment mixed with elements of science fiction, and therefore more "science" than "fiction" (with the exception of Atlantis he presented as the real thing in "20.000 Leagues Under the Sea" and ironically thus deprived Plato the status of being one of / the earliest science fiction author).
On the other hand his contemporary H.G. Wells leaned rather towards fiction than science.
I can't recall one Verne story that would "qualify" as opera. H.G. Wells on the other hand...