When the Nevado del Ruiz volcano in Colombia erupted it killed around 20,000 of the 29,000 residents in the town of Armero and left the place devastated.
The death toll from the surrounding areas brought the loss of life up to 25,000, and the town ended up being abandoned altogether.
One of the reasons why this volcanic eruption is thought to have been so deadly is because the eruption melted glaciers on the mountain, creating a pyroclastic mudflow known as a 'lahar'.
It's thought that the town of Armero was hit by three of these events, which took the lives of more townspeople who had survived the initial eruption.
One of the most famous victims was a 13-year-old girl, Omayra Sánchez Garzón, who became pinned down by debris and the volcanic mud.
Multiple rescue efforts were made to save Omayra's life, but the were unsuccessful at getting her out and after several days she died.
Rescue efforts were made, but they were unsuccessful and in the end those who tried to save her life could do little but comfort her in her final hours, they put a tyre around her to keep her afloat while people brought her sweets and drinks.
She died on 16 November, three days after the eruption, of either hypothermia or gangrene, saying: "Mommy, I love you so much, daddy I love you, brother I love you.
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