The 55 meter long, 100 dwt passenger catamaran ferry Flying Cat 4 ran aground near Tinos, Greece.  The high speed ferry with 239 passengers and 14 crew departed from Rafina bound for Santorini. When the ferry reached just outside of Tinos, the vessel ran aground in the dense fog. No reports of injuries.  Local fishing vessels came to the assistance and helped evacuate passengers off the ferry. A tug was requested to refloat the vessel.