Oven vaults, St. Louis Cemetery #1
As with all other tombs here, many people can be buried in a single vault. The remains are pushed to the back when a new burial is done. Some of these so-called "ovens" can also be rental units (though these particular ones are not). By law a tomb can't be opened until a year and a day after the last burial, so if there is another death before that time has passed, the family can rent a vault temporarily.