Catacombs
Catacombs were  chambers and passageways, often beneath a religious establishment and usually having a religious function, such as the storage of relics or sainted bodies.

In 2151  used a transmitter in the catacombs hidden beneath the monastery at P'Jem to contact  after the landing party's communicators had been destroyed by Thy'lek Shran. Later Captain Jonathan Archer defused the stand-off with the Andorians by  within a nearby reliquary the entrance to a massive subsurface sensor array. () 

Archer explored another set of Vulcan catacombs in 2154. He identified the 1800-yr-old mummified remains of T'Klaas, a student of Surak, in a passage beneath the T'Karath Sanctuary. ()

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