  UVES observations at ESO/VLT of the DLA at z=3.39 towards QSO 0000-2621
provided refined abundances for Fe, Si, N, Ni, and new abundances for O, Ar, P,
Zn, Cr, H2. These determinations confirm that the system has remarkable
properties with the lowest metallicity, a very low H2 molecular fraction and it
has no detectable presence of dust. The [alpha/Fe-peak] ratio is ~ 0.1
challenging current models of chemical evolution. The O/Ar and O/S ratios are
the same as those observed in BCGs, suggesting a universal IMF.
