russia's brutal assault unfolds. deep underground, scenes reminiscent of the second world war, the shock just zipsinking that what was unimaginable is now reality, as 36-year-old darya tells us. >> you wake up and you find out that the world is no longer the safe place you imagined. we are an independent country, ukraine, and we are not the same as russia and we don't want to be a part of russia or any other country. i cannot believe it's happening really. >> reporter: yesterday this was just an ordinary metro station full of people going to and from work. today it has become a de facto bomb shelter, and there are just hundreds and hundreds of people who have descended on this place, fearful for their lives and uncertain of what the future