Aren’t they running out of room by now? Seems like at some point - when that happens, anyway - they’d start restricting who could be buried there.
Maybe cremation will become the default process to get in? We can only hope.
My great uncle will be buried there in the same grave that now holds his son and wife. So they definately use the graves for multiple bodies.
They long ago restricted who could be buried there and under what conditions. Cite.