Removal of war debris, in which lives, memories and unexploded Israeli bombs lie buried, is one of largest clearance operations in modern history

It took all day to clear a section of road in the Tel al-Hawa neighbourhood in Gaza City. At the end of it, Ahmed Alyan, a UN engineer, was exhausted, surrounded by mountains of rubble despite the day’s work.

“I feel as if we are holding a spoon and trying to empty the sea,” Alyan said, beads of sweat trickling down his forehead after a long, hot summer day.