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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.