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Langdon continues searching the Pantheon while an eager docent follows him with architectural commentary. Vittoria rushes to Langdon in alarm and demands to see Galileo’s Diagramma, then checks its publication date: 1639.

Vittoria explains that Raphael was not buried in the Pantheon until 1758 or 1759, long after Diagramma was written. This means the clue cannot refer to Raphael’s present tomb, and Langdon realizes they have brought the Swiss Guard to the wrong location.

Vittoria questions the docent about Raphael, also known as Santi. When the docent calls Raphael an architect as well as a painter, Langdon reinterprets the clue: “Santi’s earthly tomb” may mean a tomb designed by Raphael, not Raphael’s own burial place.

The clue’s “demon’s hole” leads the docent to recall the term buco diavolo, an old name for an undercroft or ossuary annex beneath a tomb. Asked whether Raphael designed any chapel or tomb with such a feature, the docent identifies the Chigi Chapel, a tomb for Agostino Chigi and his brother, patrons connected to the arts and sciences.

The docent adds that the chapel contains pyramids and was once called Capella della Terra, which Vittoria translates as “Chapel of the Earth.” Langdon and Vittoria realize this is the true first altar of science: Earth.

Vittoria calls Commander Olivetti and tells him the Pantheon is wrong, ordering him to move his men to Santa Maria del Popolo with only four minutes remaining. She and Langdon seize a taxi and race toward the church.