A plane has plummeted towards the sea causing panic

From what one can make out from the headline and sub-head and caption and first paragraph of the this article on the Guardian website it looks like a plane has plummeted towards the sea and caused panic amongst the Air France plane who thought they were going to die.

It's hard to make out what this story is about from the headline and the sub-headline and the photograph caption and the first paragraph of this story. But I think a plane has plummeted towards the sea causing panic amongst the passengers.