Catacombs???
They were called the catacombs. They were the cemeteries of the Romans who converted to Christianity.
They hid in what is called the 'catacombs', which are underground burial places.
Catacombs are underground galleries used for burials.
An underground tomb or burial place beginning with cat is catacomb/s.
underground burial
Assuming the burial is underground, then it is called an interment, or the body gets interred. The overall "ceremony" or rite is called a funeral.
The recommended burial depth for underground electrical conduit installations is typically 18 inches to 24 inches deep.
The Pyramids have very narrow little corridors and even the grand burial Chambers are tiny to our eyes. The important chambers were filled with belongings and carvings on the walls but for the most part basic carved stone walls and corridors.
The recommended burial depth for UF cable is typically 24 inches underground.
Utilidors! The name comes from utility + corridors
a burial chamber underground, usually in a graveyard or church.
The pyramid itself is not underground but one of its three burial chambers is underground and carved into the bedrock.