The truth behind the NASA rocket disaster of 1986 that killed seven US astronauts. Why did the launch go ahead after NASA engineers called for it to be cancelled?
In March 2011, Japan was hit by a devastating tsunami killing 20,000 and triggering a nuclear meltdown. Survivors and witnesses tell their extraordinary stories.
The tsunami provokes a major meltdown at the local nuclear facility. What happened to the safeguards? What went wrong at Fukushima?
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In April 1986, a huge explosion at Chernobyl blasted radioactive dust into the atmosphere
Chernobyl left wreckage that will be radioactive for 20,000 years. But what caused it?