  The interaction processes in galaxy clusters between the hot ionized gas
(ICM) and the member galaxies are of crucial importance in order to understand
the dynamics in galaxy clusters, the chemical enrichment processes and the
validity of their hydrostatic mass estimates. Recently, several X-ray tails
associated to gas which was partly stripped of galaxies have been discovered.
Here we report on the X-ray tail in the 3 keV galaxy cluster Zwicky 8338, which
might be the longest ever observed. We derive the properties of the galaxy
cluster environment and give hints on the substructure present in this X-ray
tail, which is very likely associated to the galaxy CGCG254-021. The X-ray tail
is extraordinarily luminous ($2\times10^{42}$ erg/s), the thermal emission has
a temperature of 0.8 keV and the X-ray luminous gas might be stripped off
completely from the galaxy. From the assumptions on the 3D geometry we estimate
the gas mass fraction (< 0.1%) and conclude that the gas has been compressed
and/or heated.
