He said the aim of putting two wreaths and 75 rose petals into the sea above the wreck was to keep the memory alive of those who had lost their lives.
Speaking to the Today's programme's John Humphrys, Henia Bryer described how she has lived with the memory of such horrors and how important is it to keep the memory of the Holocaust alive.
"As the last witnesses to the horrors of World War II leave us, it is vital, it is imperative, to keep alive the memory and example of individuals like Raoul Wallenberg, " she said, describing Mr Wallenberg as a man of "moral courage and heroic example".
Just as you keep alive the memory of your fallen friends, America must keep its commitment to you.
And more than 40 American soldiers are alive today to carry on, to keep alive the memory of their fallen brothers, to help make sure that this country that we love so much remains strong and free.
Electricity still courses through main memory to keep the bits alive.
But now "we are at a historic point where some new ideas are being able to question the orthodoxy of the amyloid hypothesis, " says Zaven Khachaturian, president of Keep Memory Alive in Las Vegas and former head of Alzheimer's research at the National Institutes of Health.
The citation for his honour described how Mr Barrell's warmth and dedication to others had helped keep his son's memory alive and also benefited the whole community.
BBC: Charity work helped Kent father Peter Barrell face loss
Then, in a rambling speech that evoked the bombastic oratory of Chavez, Maduro said he would work to keep alive his memory and legacy.
CNN: Venezuela's vice president sworn in as interim president
That difference is "unexpected but not inexplicable, " says Zaven Khachaturian, president of Keep Memory Alive in Las Vegas and former head of Alzheimer's research at the National Institutes of Health.
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