A wreath is thrown into the sea during a service of remembrance aboard the Titanic Memorial Cruise, over the Titanic disaster site 100 years after it sank in the western Atlantic Ocean April 15, 2012. The ill-fated Titanic liner hit an iceberg and sank 100 years ago on April 15, 1912. REUTERS/Chris Helgren (CANADA - Tags: ANNIVERSARY TRAVEL DISASTER)