A ferry is docked during the second day of seamen's union's strike at a port of Piraeus, near Athens, Tuesday, Sept. 4, 2018. Greek ferry crews on Monday decided to extend for at least one more day a strike that has left tens of thousands of travelers stranded on the country's popular island destinations. [Photo: AP/Thanassis Stavrakis]

Ferries are docked during the second day of seamen's unions' strike at a port of Piraeus, near Athens, Tuesday, Sept. 4, 2018. Greek ferry crews on Monday decided to extend for at least one more day a strike that has left tens of thousands of travelers stranded on the country's popular island destinations. [Photo: AP/Thanassis Stavrakis]

Travelers carry their bags during seamen's unions strike at the port of Piraeus, near Athens, Monday, Sept. 3, 2018. Ferries are due to be halted by a 24-hour strike Monday, as unions seek the return of benefits and pay scales scrapped or frozen during eight years of international bailouts that ended in late August. [Photo: AP/Thanassis Stavrakis]