President Michael D Higgins has lead a commemoration ceremony in Cork to mark the 100th anniversary of the sinking of the Lusitania.
1,201 lives were lost when the passenger ship was sunk by a German U-Boat off the Cork coast on May 7, 1915.
Today's ceremony was also attended by the British, German and US ambassadors to Ireland.
Eoin McGarry, who has dived at the wreck site more than anyone else. He travelled to the site today with the ship's owner Greg Bemis.
There, they placed a flower a capsule, which they could then place on the submerged ship.
George Harrison, a 2nd engineer with Cunard, had a great-grandfather named George Little who was an engineer on the Lusitania.
His great-grandfather survived, but developed pleurisy from being in the water which caused health problems for the rest of his life. Harrison said the disaster had huge impact on his great-grandfather's life.
"He was a changed man after that day. It's not something that your would have talked about - post traumatic stress was not something that would have been identified at the time," he said.
"I'm told he used to spend time simply staring out the window … [and had] nightmares."