[en] The X-ray source 3A0745-191 is identified with intracluster gas surrounding the giant galaxy containing the radio source, PKS 0745-191, which lies at z=0.1. The gas is cooling at the unprecedented rate of 1000 solar masses yr^-1. Optical line-emitting gas extends more than 10 kpc from the centre of the galaxy and corroborates the high mass-flow rate. The optical spectrum is similar to that of distant 3CR radio galaxies reported by others. It is concluded that the formation of a giant galaxy is being observed. (author)