KATRIN is a German acronym (Karlsruhe Tritium Neutrino Experiment) for an undertaking to measure the mass of the electron antineutrino with sub-eV precision by examining the spectrum of electrons emitted from the beta decay of tritium. The core of the apparatus is a 200 ton spectrometer, which has been built by MAN DWE GmbH in Deggendorf and was shipped to Karlsruhe via an 8600 km route involving the Black Sea, the Mediterranean Sea, the Atlantic Ocean and the Rhine. The construction is proceeding well with several of the major components being already on-site.