When the parish church was being built many items of material heritage were carefully stored in the crypt. The crypt protects many stone and archaeological sculptures and fragments of decorative stone plastic. Tombstones from ancient times to late medieval times are also part of the crypt's treasure. The crypt is also home to a wooden altar from the 11th century and a stone sarcophagus from the 7th Century which holds the remains of the Blessed Julian, the patron saint of Bale.