Grotto (Confessio)

View of the "Grotto" (Confessio) that is located below the High Altar.   From top to bottom a chain, that is said to have restrained Paul while he was under house arrest in Rome, is encased in a box.

Below that is a grating and behind that a small portion of the sarcophagus that is said to contain the remains of Saint Paul is barely visible.  Below the glass floor are rock carvings and a portion of the apse of an earlier church.