Ricardo : I’m not sure there were any passenger ships along the Danube in 1905. Taking a ship from Odessa to Hamburg and then another one to Argentina seems unlikely.  But : they can very well have traveled somehow from Izmail to Odessa, or to Iasi or to an even closer place like Galatz (Gali). In 1905 there was already a railway line  from those places, northbound. I could imagine they traveled for say 12 hours to Kamenetz-Podolsk and from there, by cart again, to Brody, in Galicia.  My own grandparents came from Kamenetz to Argentina in 1889.   Jorge Sexer