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IceCube turns Antarctic ice into a Cherenkov detector: $5160$ digital optical modules on $86$ strings span depths of $1450$–$2450\mathrm{m}$. Hot-water drilling allowed deployment before refreezing. Neutrino interactions produce charged particles; their Cherenkov radiation, rather than the incoming neutrino, supplies the optical readout.^[ref]

Neutrino astronomy asks where the incoming neutrino originated. A Cherenkov detector asks how its reaction products make measurable light. Connecting these questions requires track reconstruction, detection efficiency and background tests. An astronomical messenger and the light carrying information inside the apparatus are different stages of one inference.