The word for today is…
crypt (noun) -
1a: a chamber (such as a vault) wholly or partly underground, especially : a vault under the main floor of a church
b: a chamber in a mausoleum
2a: an anatomical pit or depression
b: a simple tubular gland
Source : Merriam-Webster
Etymology : Hidden under the main floor of a great church is often a large room, often with a tomb as its centerpiece. Many major European churches were built over the remains of a saint—the Vatican's great St. Peter's Basilica is an example—and instead of having the coffin buried, it was often given its spacious room below ground level. In a large aboveground tomb, or mausoleum, there may be several small chambers for individual coffins, also called crypts; when the comic book Tales from the Crypt made its first appearance in 1950, it was this meaning that the authors were referring to.
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