They come out here once a generation and hold exercises.
And anyway, it is not the first time they have held such exercises.
The officials said it was one of the largest exercises held by the Russians in recent years.
The tunnel must hold regular live exercises in conjunction with the emergency services.
We announced our intention to hold such exercises as long ago as 1982.
The two nations have frequently held joint military exercises and co-operate on technology.
Iran held military exercises near the border last week, saying its action was meant to send a signal to the Taliban.
Iran announced today that it would hold its largest air and naval exercises in the gulf next month.
Eventually those fears subsided, making way for what is now known as "drop, cover and hold" exercises.
It was the largest exercise yet held in Europe, and chemical companies were there to see what can happen when their cargoes are damaged.