The Chernobyl reactor fire released approximately 400 times more radioactive material than the Hiroshima atomic bomb, according to IAEA reports.
The engineering response was extraordinary: 600,000 liquidators deployed, a concrete sarcophagus built in 206 days, and a 2,600 km2 exclusion zone established.
The New Safe Confinement - a 108-metre steel arch built to cover the original sarcophagus - was completed in 2016.
It is the largest movable structure ever built.
Designed to last 100 years.
The disaster was catastrophic. The engineering that contained it was remarkable.
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