It tolls when a member of the Royal Family dies and was heard after the deaths of Diana , Princess of Wales and Queen Elizabeth The Queen Mother . It is now rung for ceremonial purposes to commemorate disasters such as the 9/11 disaster , the Asian tsunami , and the London Bombings , and is always rung at the start and end of the two minutes silence on Armistice Day
Asian tsunami
2004 Indian Ocean earthquake and tsunami
HMS Lutine (1779)