Catacombs

Catacombs were underground 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 Trip Tucker used a transmittor in the catacombs hidden beneath P'Jem to contact the Enterprise after the landing party's communicators had been destroyed by Thy'lek Shran. Later Jonathan Archer defused the stand-off with the Andorians by discovering 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. 

Background
The Children of the Son cave on planet 892-IV to which Kirk, Spock and McCoy were taken in 2268, while not technically underground, would seem to be an echo of the catacombs that sheltered Earth's early Christian outlaws. While 892-IV has had its Christ and even television, it has not yet had its Constantine. 

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Katakombe Catacombes