Vatican City
Rome Italy
2016

Ventilation to the Crypt of Pius XII

http://stpetersbasilica.info/Grottoes/Pius%20XII/Tomb%20of%20Pius%20XII.htm

The Tomb of Pius XII
Vatican Grottoes

In front of the Clementine Chapel is the shrine faced with travertine with the tomb of Pius XII, Eugenio Pacelli (1939-1958). The room was created in 1954 by Vincenzo Fasolo when the early Christian sarcophagus of Junius Bassus was removed. It has linear, symmetrical plan, almost in the shape of a cross. In the apse, is the simple white sarcophagus on a travertine base, following the pontiff's wish, with the inscription PIUS P.P. XII on the front and the monogram of Christ on the lid.


https://www.walksinrome.com/a-guide-to-st-peters-basilica.html

St. Peter’s Basilica is the largest church in the world. It stands above the spot where St Peter is thought to have been buried. The basilica is the second church to have been erected here; the first was built by Emperor Constantine the Great (r. 306-337) between 324 and 329.