When there's an atomic explosion on Earth, the radioactive particles will drift up to this layer and set off a chain reaction. It'll go around the world in microseconds. And that's the end.
15 seconds sound clip from the Dimension X - The Outer Limit by Graham Doar classic radio play.
You can hear this line at 00:17:53 in the radio play.
Quote context
[...]
- Quiet.
- How are they going to do it, Steve?
- He's blacked out again. I guess that's all.
- You don't think that really happened?
- I don't like to see this. I've seen too many good test pilots snap.
[...]