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.

BBC: HMS Affray submarine sinking remembered off Alderney

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.

BBC: Holocaust terror 'should never be forgotten'

"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".

BBC: Australia gives Holocaust hero Wallenberg citizenship