I was in Plymouth last year when an unexploded WW2 bomb was discovered in someone's back garden.
After much deliberation, it was decided to dig it up and move it to the breakwater and take it out to sea, where it could be detonated safely.
The city Council deployed the mobile emergency alert to inform people of the exclusion zone as the bomb was being transported through the streets.
We were in the city centre at the time along with hundreds of other people. It was quite disconcerting when everyone's phone started making this odd noise and we were all frantically staring at the screens trying to stop it.