"On  March 7, we learnt what a vacuum bomb was. In the afternoon, we sat down in the kitchen with the children at the table, collecting Lego. I hear an arrival. I push everyone out of the kitchen. I shout: "Corridor!"," Olha, a resident of Mariupol, recalls. "I am being pulled back. I want to take a step forward, but I'm being pulled back... My neighbour pulls me out of the apartment. We can't close the door. Some force pulls you in a different direction. A scary sound. The neighbour says: "It's a vacuum bomb."