Basilica of S. Nicola: The Saint's Crypt . 5 by hquittner
The crypt windows are of "translucent" marble or alabaster making it rather dark. There are 7x4 ancient columns and capitals all different in material, all hastily assembled from the numerous Greek ruins round about. There is a silver altar and the Saint's remains beneath behind a grille. Upon arrival the relics were exuding a liquid (which was called "manna") which had miraculous protective properties. The phenomenon and its effects have continued to this day.(Source :crypt condensation?). Small vials of this are provided to piilgrims in some manner . I did not see any place selling them, but we were told every believer in Bari keeps a vial in their home or on their boat. Obviously how the fluid is presently obtained is a church secret.
The crypt is floored with a coarse but colorful mosaic tilework.