The rubble of the numerous civilian homes and buildings you've leveled are the mass graves.
Those houses are full of people and there are estimated to be thousands of dead under the rubble.
Thousands of bodies lie buried in Gaza’s rubble. Families dig to retrieve them, often by hand
https://www.latimes.com/world-nation/story/2023-11-17/bodies...
Under the rubble: The missing in Gaza
Finding the 7,000 Palestinians believed buried under collapsed buildings is becoming increasingly difficult.
https://www.aljazeera.com/features/longform/2023/12/28/under...
‘Scarred for life’: the families still seeking dead amid Gaza rubble
https://www.theguardian.com/world/2023/nov/25/scarred-for-li...
etc etc.