That is sent downstairs to the Master Control Room (MCR) where computers turn it into a signal and then send it 36,000km into space.
It gets bounced off a satellite dish and then whizzes 36,000km back down to London to the BBC television centre - and all that takes just two seconds.
When Ellie introduces reports from Athens, they have her voice on them as well, but she's not reading those words when you hear them.
Instead they have been recorded and sent back to London hours ago. Why? Well, for more details on that, you'll have to read part two...