The interior also holds Rococo chapels of the Holy Cross and St John of Nepomuk, an ambo, tombstones, epitaphs, the Pomeranian Dukes tomb, the Kos family tomb, bishop’s crypt, antique chandeliers, canopies, and many other antiquities, including a feretory of great cultural value, showing Our Lady of Oliwa with an Infant Jesus.
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In 1972 O'Rourke's ashes were moved from Campo Verano to his former bishopric in Poland; they were buried in a crypt in the Oliwa Cathedral.