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 RMS Titanic sent more than 1,500 people to a watery grave.
As the 1912 disaster was commemorated around the world, 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 has been retracing the route of the doomed voyage, as the ship stopped early Sunday at the spot where the Titanic went down in the early hours of April 15, 1912.
After a short 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 in southwest England and whose great-uncle died 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. "You are in the middle of nowhere. And then you look down over the side of the ship and you realize that every man and every woman who didn't make it into a lifeboat had to make that decision, of when to jump or stay on the ship as the lights went out."
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, at the time the world's largest and most luxurious ocean liner, was traveling from England to New York when it struck an iceberg at 11:40 p.m. April 14, 1912. It sank less than three hours later, with the loss of all but 700 of the 2,208 passengers and crew.
A century later, events around the globe marked a tragedy that retains its grip on the world's imagination.
In Belfast, a memorial monument was unveiled Sunday at a ceremony attended by local dignitaries, 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. Officials say 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.
Belfast spent decades scarred by its link to the disaster, but it has come to take pride in the feats of engineering and industry involved in building the ship. Last month, a gleaming new visitor attraction, Titanic Belfast, opened on the site of the shipyard where the doomed vessel was built.
Remembrance ceremonies also were being held in the ship's departure port of Southampton, southern England -- home to hundreds of Titanic crew who perished -- and in Halifax, Nova Scotia, where more than 100 victims of the tragedy are buried.