At either side of the church, on the altar side of the transept, are two grottoes. On the left is the tabernacle, containing the reserve of the consecrated hosts. On the right is the almery which contains the vessels of the Oil of the Catechumens, Oil of the Sick, and Sacred Chrism. These vessels are replenished annually, when a new supply is blessed at the chrism Mass by the bishop. The oils are then received at the Holy Thursday Mass of the Lord's Supper, in accordance with local ritual.