You're probably thinking of the Tunguska Event.
Tunguska was the first thing I thought of when I heard this story.
I remember seeing a special on the Science channel that suggested a Tunguska style meteor, but quite larger, was what really destroyed Sodom and Gomorrah. The meteor didn't even hit there, just debris from the meteor. The meteor itself supposedly landed in the alps somewhere, clipping the top of a mountain off in the process. They apparently tested the dirt layer from around that time and it showed something that would be characteristic of an air-burst meteor. There was also a clay tablet written by some astronomers in the Middle East on the same night it happened, and the tablet showed the meteor. Somehow using the tablet scientists used a computer model to show where the meteor would have come from, and if I remember right it originated in the solar system's asteroid belt. I wish I could find the show again, it was interesting, and I want to see what other info could be dug up to see if it had any truth to it, and wasn't some complete ancient aliens style bullshit.
Don't worry about the meteorite. Worry about the "Attack Response" button.
The automatic Dead Hand system isn't used anymore from what some people with knowledge of it have said.