Cave In
He knelt down and looked carefully at the spot. His worst fears were confirmed as he saw the crack in the paving. However, before he could think much about it, he watched as a hole started to open up before his eyes.
Mark scrambled away as he watched the hole open, concrete and dirt disappearing into the widening hole. He knew he was powerless as he watched it happen. Finally, the dust settled and as he waved it away from his face Mark finally saw the reality of what happened.