ABOARD MS BALMORAL -- With prayers, a hymn and a moment of silence broken by a ship's deep whistle, passengers and crew on a memorial trip marked 100 years to the moment since the Titanic sent more than 1,500 people to a watery grave.

And the city that built the vessel -- Belfast, Northern Ireland -- looked back on the tragic sinking with a distinctive mixture of sorrow and pride.

In the North Atlantic, passengers lined the decks of the MS Balmoral, a cruise ship that retraced the route of the doomed voyage, as it stopped early yesterday at the spot where the Titanic went down in the early hours of April 15, 1912. After a service and a moment of silence, three floral wreaths were cast onto the waves as the ship's whistle sounded in the dark.

Jane Allen, from Devon, southwest England, whose great-uncle perished on the Titanic, said the moment vividly reminded her of the horror of the disaster. "All you could hear was the swell splashing against the side of the ship. You could see the white breakers stretching out to sea," she told the BBC.

Another cruise ship, Journey, which traveled from New York, also held a service at the site, 400 miles off the coast of Newfoundland.

The Titanic struck an iceberg at 11:40 p.m. on April 14, 1912. It sank less than three hours later, with the loss of all but 700 of the 2,208 passengers and crew.

In Belfast, a memorial monument was unveiled yesterday at a ceremony attended by relatives of the dead and explorer Robert Ballard, who discovered the wreck of the Titanic on the ocean floor in 1985.

A brass band played as the granite plinth bearing bronze plaques was uncovered beside Belfast City Hall. It is the first Titanic memorial to list all victims alphabetically, with no distinction between passengers and crew members, or between first-, second- or third-class travelers, officials say.

Remembrance ceremonies also were held in the ship's departure port of Southampton, home to hundreds of Titanic crew who perished, and in Halifax, Nova Scotia, where more than 100 victims are buried.

In New York, the auction house Bonhams sold an original ticket to the Titanic and a dinner menu from the ocean liner. The ticket fetched $56,250, including the auction house premium. The menu sold for $31,250.

A comparatively low price was paid for a telegraph message that read, "We have struck an iceberg." That message, sold for $27,500, was sent to Titanic's sister ship, the Olympic.

Venues in Las Vegas, San Diego, Houston and Singapore hosted exhibitions that included artifacts recovered from the site of the wreck. Among them: bottles of perfume, porcelain dishes and a 17-foot piece of hull.

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