 It is surrounded by a much larger crypt, the Saint Fulbert Crypt, which completed in 1025, five years after the fire that destroyed most of the older cathedral.It is U-shaped, 230 meters long, next to the crypts of St. Peter's Basilica in Rome and Canterbury Cathedral, it is the largest crypt in Europe and serves as the foundation of the Cathedral above.The corridors and chapels of the crypt are covered with Romanesque barrel vaults, groin vaults where two barrel vaults meet at right angles, and a few more modern Gothic rib-vaults.