The concrete vault helps prevent the gravesite from sinking. The coffin or casket will decompose, and there’s a lot piled on top of it, and people and equipment

The concrete vault helps prevent the gravesite from sinking. The coffin or casket will decompose, and there’s a lot piled on top of it, and people and equipment go over it, so with time it can cave in. https://en.m.wikipedia.org/wiki/Burial_vault_(enclosure) https://en.m.wikipedia.org/wiki/Burial_vault_(enclosure)