Sea waves hit the Blue Star Paros vessel during a nine-hour trip to the Greek islands of Paros, Naxos, Ios and Santorini, in the Aegean Sea on March 14, 2012.

A Greek passenger seen on the Blue Star Paros vessel during a nine-hour trip to the Greek islands of Paros, Naxos, Ios and Santorini.

Foreign tourists admire the volcanic island of Santorini.