But that historic collapse basically happened (quite unexpectedly) in autumn of 1989.

But neither the goal, nor our collapse, should have happened.

"We have to figure out how these late collapses happen."

Though it was feared that several workers had been killed, the collapse happened during lunch, and all the miners were outside, eating.

"It's not like the collapse only happened in the United States."

There is no conclusion about the reason why this collapse happened even after three expertise done since.

The collapse happened while people in the building were sleeping, so no one had time to flee.

The last disastrous collapse happened on 11 May 1803.

That question is settled, because such collapses have actually been happening recently, and others appear to be imminent.

The collapse, as it turned out, happened at an inopportune moment.