crypt

/krɪpt/
noun
  1. An underground room or vault, typically under a church, used as a burial place.
    • Tourists visited the crypt beneath the cathedral to see the ancient tombs.
    • The old church has a crypt where several bishops are buried.
    • The crypt was dark and damp, with stone coffins lining the walls.
  2. A hidden or secret place, often used for storage or concealment.
    • They discovered a crypt behind the wall filled with old paintings.
    • The spy kept important documents in a crypt beneath the floorboards.
    • The treasure was hidden in a crypt deep inside the mountain.
Synonyms
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