Science News has an exploration of the deeper implications of neutrino oscillation, one experimental confirmation of which we discussed last month. "The new findings could even signal a tiny breakdown of Einstein's theory of special relativity. ... MINOS [for Main Injector Neutrino Oscillation Search] found that during a 735-kilometer journey from Fermilab to the Soudan Underground Laboratory in Minnesota, about 37 percent of muon antineutrinos disappeared — presumably morphing into one of the other neutrino types — compared with just 19 percent of muon neutrinos. ... That difference in transformation rates suggests a difference in mass between antineutrinos and neutrinos. ... With the amount of data collected so far, there's just a 5% probability that the two types of particles weigh the same."
Actually they call the individual detectors DOMs-Digital Optical Modules. Each string has 60 DOMs on it (plus 4 DOMs on the surface config IceTop) and altogether there will be 86 strings. Right now there are 79. Of course they calibrate, test, re-test before deployment, and troubleshoot when there are problems, but yeah if a DOM is out it's out.
An event reconstruction from the 79 string detector configuration https://blog.icecube.wisc.edu/?p=1355