Patrick Piette (L) and Isabelle Prooth of Aalst, Belgium pose on board the Titanic Memorial Cruise, which they booked for their 25th wedding anniversary, in the mid-Atlantic Ocean April 11, 2012. The cruise is retracing the voyage of the ill-fated Titanic liner, which hit an iceberg and sank 100 years ago on April 15, 1912.[Photo/Agencies]

Francoise Geerts and Jacky Hanchir of Brussels and Elisabeth and David Vergaelen of Mechelen, Belgium pose on board the Titanic Memorial Cruise in the mid-Atlantic Ocean April 11, 2012. The cruise is retracing the voyage of the ill-fated Titanic liner, which hit an iceberg and sank 100 years ago on April 15, 1912.[Photo/Agencies]