Last week, Michael Comyn made the case for silence. This week, the exception — because there's a second kind of silence, the sentence that was formed, weighed, and then never said.

Aviation has a name for the conditions that produce it: the authority gradient, the slope of rank and reputation that information has to climb to reach the person in charge.

On a first officer who hinted four times instead of shouting once, on the three words a captain said that saved a hundred and eighty-five people, and on why we, in this country, are world-class at not quite saying the thing.

The voice that tells Ireland to mind the gap spent thirty years being trained never to let silence happen. In radio, they call it dead air — eight seconds of quiet and alarms sound in rooms you'll never see.

Then Michael found himself in coaching rooms where the silence after a question turned out to be the only part that mattered.

On studio clocks, Irish funerals, the forensic recall of two men avoiding one true sentence, and the answer that only arrives after eleven seconds.

Twenty-six years ago, a voice was recorded in a studio in Manchester. Two takes. The first was used. The second was a safety copy. Nobody thought it would matter.

That voice now tells millions of people to mind the gap. Every day. Several thousand times.

And still, people fall in the gap.

In this Season 5 opener, Michael Comyn returns to the recording studio, to the moment a four-word warning was created almost by accident, and asks the uncomfortable question that the Irish rail network has been wrestling with: why does the most repeated instruction in someone's daily journey arrive when nobody's home?

It's a season about the conversation underneath the conversation. About what's said versus what's heard. About the strange truth that the words you weigh the most are almost never the ones that carry the furthest.

Welcome back to Mind the Gap.