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If we are attacked by nuclear weapons, these are the warning sounds you must recognize.

First, the attack warning.

If an attack is expected, the sirens will sound a rising and falling note like this.

Music Welcome to episode 11 of Cold War Conversations.

That chilling piece of audio you've just heard was from a public information film that was to be broadcast to the British public should nuclear war have

been imminent. Today we're covering the Royal Observer Corps, a British civil defence unit that would

have been in the front line of monitoring a nuclear

attack on the UK. We're talking to Alastair McCann, who has preserved an underground Royal

Observer Corps monitoring post as a museum in Northern Ireland. We talk about the museum, the

difficulties of the Northern Ireland Royal Observer Corps

are in the Troubles and what the reality would have been for these men and women should

the Cold War have turned hot.

I hope you find our conversation as interesting as I did.

We welcome Alistair McCann.

Hi Alistair.

How are you?

I am very well, Ian. Thank you very much for having me on.

Well, no. Thank you very much for coming on Cold War conversations. I really appreciate it,

and I'm quite intrigued to hear about your project. So could you tell me a little bit about

...