Under the main altar of the cathedral is a crypt with the remains of most of the bishops and archbishops, and of several other clergymen, of Philadelphia.
The crypt can be reached by stairs behind the main altar.
The crypt is the final resting place of:
Michael Francis Egan, O.S.F., first bishop of Philadelphia, consecrated October 28, 1810, died 1814.

Henry Conwell, second bishop of Philadelphia, consecrated 1820, died April 22, 1842.

Francis Patrick Kenrick, third bishop of Philadelphia, elevated to Archbishop of Baltimore in 1851, died 1863.

James Frederick Wood, fifth bishop and first archbishop of Philadelphia, died June 20, 1882.

Patrick John Ryan, sixth bishop and second archbishop of Philadelphia, died February 3, 1911.

Edmond Prendergast, seventh bishop and third archbishop of Philadelphia, died February 26, 1918.

Dennis Joseph Dougherty, eighth bishop, fourth archbishop of Philadelphia, and first to be elevated to cardinal, died May 31, 1951.

John Krol, tenth bishop, sixth archbishop of Philadelphia, and third to be elevated to cardinal, died March 3, 1996.

Anthony Joseph Bevilacqua, eleventh bishop, seventh archbishop of Philadelphia, and fourth to be elevated to cardinal, died January 31, 2012.
Under the main altar of the cathedral is a crypt with the remains of most of the bishops and archbishops, and of several other clergymen, of Philadelphia. The crypt can be reached by stairs behind the main altar. The crypt is the final resting place of:
Michael Francis Egan, O.S.F., first bishop of Philadelphia, consecrated October 28, 1810, died 1814.
Henry Conwell, second bishop of Philadelphia, consecrated 1820, died April 22, 1842.
Francis Patrick Kenrick, third bishop of Philadelphia, elevated to Archbishop of Baltimore in 1851, died 1863.
James Frederick Wood, fifth bishop and first archbishop of Philadelphia, died June 20, 1882.
Patrick John Ryan, sixth bishop and second archbishop of Philadelphia, died February 3, 1911.
Edmond Prendergast, seventh bishop and third archbishop of Philadelphia, died February 26, 1918.
Dennis Joseph Dougherty, eighth bishop, fourth archbishop of Philadelphia, and first to be elevated to cardinal, died May 31, 1951.
John Krol, tenth bishop, sixth archbishop of Philadelphia, and third to be elevated to cardinal, died March 3, 1996.
Anthony Joseph Bevilacqua, eleventh bishop, seventh archbishop of Philadelphia, and fourth to be elevated to cardinal, died January 31, 2012.
Cathedral Basilica of Saints Peter and Paul (Philadelphia)