The Tunnel

Walking through a tunnel under my nearby City. I was with an off duty policewoman. We met a well known businessman, who was present on my first rock climb, Crowberry Ridge on Buchaille Etive Mhor. We chatted and moved on towards the tunnel exit, outside the Clydesdale Bank.
No traffic, no people, just silence.
"Must be a Public Holiday," was the marginally reasonable explanation.
Then I saw two world maps on the diagonally opposite street corner.
A ghostly figure was colouring them in, although the marks were appearing in advance of his brushstrokes. We watched in fascination.
One was a weather map, obvious enough, wind directions predominant.
The other had numerous red blotches surrounded by black fuzzy expanding circles. Some were on the UK.
Then we realised what was going on.
Nuclear War, Armageddon probably.
Back to the Tunnel?