On 15 August 1950, an 8.6 magnitude earthquake shook the Himalaya mountains – wiping out whole villages in Tibet and north-east India.
The death toll was estimated to be about 4,800.
The late British botanist Frank Kingdon-Ward was camping in Tibet with his wife Jean when the ground beneath them began to sag.
“I felt as though we were lying on a pie crust against whicha steam hammer was drumming,” he said.
“In another minute it must crack, crumple, and drop us into the shuddering interior of the earth.
“I can't convey to you our terror, bewilderment, sense of utter helplessness.”
The pair had been planning to go seed hunting in the mountains. Instead, they were stranded with limited rations.
In an interview he gave to the BBC in 1951, Frank Kingdon-Ward describes the destruction the quake caused and their perilous journey to safety.
This programme is made in collaboration with BBC Archives. It's produced and presented by Vicky Farncombe.
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(Photo: A bridge damaged by the 1950 earthquake in Assam, India. Credit: Getty Images)