At the end of April 1986, a safety test at the Chernobyl power plant in Ukraine went very wrong.
While the town slept, a sudden power surge led to a series of explosions at 1:24 am – killing two instantly.
The first people knew of it was likely when a fireball erupted into the sky – described by some onlookers as not unlike fireworks.
“There was a heavy thud,” recalls Sasha Yuvchenko, who was on the night shift at the Chernobyl power plant at the time.
“A couple of seconds later, I felt a wave come through the room.”
“The thick concrete walls were bent like rubber. I thought war had broken out… Steam wrapped around everything; it was dark and there was a horrible hissing noise,” he told The Guardian.
The heat emitted from the power plant was so intense that firefighters called to the scene watched as their boots melted.
Though Yuvchenko didn’t feel anything at the time, within an hour he began vomiting uncontrollably. His throat hurt.
He was transported to Moscow, where the men either side of him died an excruciating death; burning from the inside out.
Over the next several days, a cloud of radioactive dust travelled across northern and western Europe, extending as far as the United States. Nuclear rain fell as far as Ireland.
An evacuation zone was established, 36 hours too late, with more than 68,000 people evacuated from a 30 kilometre radius.
Potentially deadly rain poured for the next eight days, as the power plant continued to burn.
Yuvchenko, along with hundreds of others, suffered acute radiation sickness, which begins with symptoms like nausea, vomiting and headaches.
While some recovered, over the next weeks and months, many died a slow and painful death.
Now a new documentary, Inside Chernobyl with Ben Fogle, which airs tonight on Channel Seven, will explore one of the worst man-made disasters in history.
Watch a sneak peek for Inside Chernobyl. Post continues below.