The sources and fluxes of superGZK neutrinos, $E>10^{20}$ eV, are discussed. The most promising sources are reionization bright phase, topological defects, superheavy dark matter and mirror matter. The energy of neutrinos can be above the GUT scale ($sim 10^{16}$ GeV). The predicted fluxes are observable by future space detectors EUSO and OWL.
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