There was an episode of MythBusters where they buried a couple pigs in concrete to see what decomposing bodies do in exactly that case. They indeed leave a gross hollow space.
According to the netflix series called High Tides that I watched the rich bury dead bodies in the buildings they build to hide them and Netflix would never lie to me
Not a concrete expert, but dead bodies. They decompose, can create pockets of pressurised gas, and leave a hollow cavity of no structural strength.
Source: Me. I made it up, but seems plausible.
There was an episode of MythBusters where they buried a couple pigs in concrete to see what decomposing bodies do in exactly that case. They indeed leave a gross hollow space.
I mean your username is literally “towerful” so I expect you to know something about towers that don’t collapse, I guess?
According to the netflix series called High Tides that I watched the rich bury dead bodies in the buildings they build to hide them and Netflix would never lie to me