DDO68-V1: an extremely metal-poor LBV in a void galaxy
  The lowest metallicity massive stars in the Local Universe with
Z~(Zo/50-Zo/30) are the crucial objects to test the validity of assumptions in
the modern models of very low-metallicity massive star evolution. These models,
in turn, have major implications for our understanding of galaxy and massive
star formation in the early epochs. DDO68-V1 in a void galaxy DDO68 is a unique
extremely metal-poor massive star. Discovered by us in 2008 in the HII region
Knot3 with Z = Zo/35 [12+log(O/H)=7.14], DDO68-V1 was identified as an LBV
star. We present here the LBV lightcurve in V band, combining own new data and
the last archive and/or literature data on the light of Knot3 over the 30
years. We find that during the years 2008-2011 the LBV have experienced a very
rare event of `giant eruption' with V-band amplitude of 4.5 mag (V~24.5-20
mag).
