New results on the superdeformed $^{196}$Bi nucleus a re reported. We have observed with the EUROBALL IV $gamma$-ray spectrometer array a superdeformed trans ition of 124 keV which is the lowest observed energy $gamma$-ray in any superdeformed nucleus. We have de velopped microscopic cranked Hartree-Fock-Bogoliubov calculations using the SLy4 effective force and a realistic surface p airing which strongly support the $K^pi=2^-$($pi$[651]1/2$otimes u$[752]5/2) assignment of this su perdeformed band.
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