"A crypt (from Latin crypta "vault") is a stone chamber beneath the floor of a church or other building. It typically contains coffins, sarcophagi, or religious ...
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relics.
Originally, crypts were typically found below the main apse of a church, such as at the Abbey of Saint-Germain en Auxerre, but were later located beneath chancel, naves and transepts as well. Occasionally churches were raised high to accommodate a crypt at the ground level, such as St MichaelĀ“s Church in Hildesheim, Germany." - (en.wikipedia.org 12.03.2022)