My work colleague, who is a teacher, has been given a 7 day extension to his visa to sort out his paperwork as it wasn't complete. He was on a one year work visa. The extension will expire shortly. If the correct documentation hasn't arrived by this time what happens?

I was thinking he would have to leave the country and get a new non-B but i'm not sure and do not wish to worry him if it's not true.

Yes that is what would happen. But not the end of the world as people do it every day.

Thanks, yes not the end of the world, but a bit of a pain.