  The Icarus T600 detector represents the first example of a fully working
large-mass LAr detector. After operations at the LNGS INFN laboratories, it has
been refurbished at CERN in 2015-2017 and then installed as far detector on the
BNB neutrino beamline at FNAL. The main operations involved in the T600
overhauling are thouroghly described in this paper.
