The 192 meter long, 18718 dwt ro-ro ferry Aqua Hercules became disabled off Igoumentsia, Greece.  The ferry was en route to Bari, Italy with 207 passengers when the vessel suffered engine failure.   The ferry was able to reach Igoumentsia under its own power where it safely unloaded passengers and vehicles.   No reports of injuries, damage or pollution being released.   Reports state the Aqua Hercules will undergo repairs at Igoumentsia and inspection later.