emergency

It's something you don't ever think about until you read an article about it: you're in danger, cannot talk, so dial 999 (or 112) for the emergency services. But...you can't talk to the operator.

So, what happens next?

Read here.

Basically - dial 999...and if you are in no position to talk, then press 5 5.
Why hasn't this been public knowledge until now?!