The 119 meter long, 3345 dwt freighter Optimaflot went aground on the Volga-Caspian Canal at marker 150.5.   The Optimaflot was headed from Turkmenbashi to Astrakhan with a cargo of  2340 metric tons of diesel fuel.    Reports state the vessel was refloated the same day with the assistance from motor vessel M3-149.   No reports of injuries, damage or pollution being released.