Chamoli disaster: 'It hit the valley floor like 15 atomic bombs' | WHAT REALLY HAPPENED X-Frame-Options: DENY X-Frame-Options: SAMEORIGIN

Chamoli disaster: 'It hit the valley floor like 15 atomic bombs'

So it was with the Chamoli disaster (Link:https://www.bbc.com/news/world-asia-india-55975743) back in February, when the flank of a Himalayan mountain failed and fell into the valley below.

It set in train a cascade of debris that claimed over 200 lives and destroyed hydro-electric infrastructure worth hundreds of millions of dollars.

You may have caught some of the mobile phone footage that was shared at the time. A horrifying wall of slurry racing downslope, sweeping away everything in its path.

An international group of more than 50 researchers has now published a detailed assessment of what happened. It's based on multiple data sources, from satellite imagery to field observations.

It's a sombre read that reports numbers that, to be honest, are almost beyond comprehension.

The disaster was initiated close to the top of the 6km-high Ronti Peak in the Chamoli district of the Indian state of Uttarakhand.

A wedge of glacier-covered rock more than 500m wide and 180m thick just suddenly let go.

The team calculates almost 27 million cubic metres of material was put into a minute-long descent that at one point was in complete freefall.

To put this volume in context, it's about 10 times that of the Great Pyramid of Giza in Egypt.

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