Passengers on the Titanic Memorial Cruise dance to a Belgian string band after departure from Cobh April 9, 2012. The ship's authorities have decided to cancel scheduled ballroom dancing on April 10 due to rough seas. 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. Picture taken April 9, 2012. [Photo/Agencies]

An Irish Coast Guard helicopter arrives to evacuate a man suffering from a heart ailment from the Titanic Memorial Cruise ship MS Balmoral, in the Atlantic Ocean off Ireland April 10, 2012. Tour operator Miles Morgan said the ship would head back 20 nautical miles towards Ireland in order to be in range for a helicopter tasked with evacuating a man with a non life threatening heart condition. [Photo/Agencies]