The dig is taking place underneath one of the walls of the disused bull ring, a wall which has been reinforced specifically so that the archaeologists could begin their work beneath it, and the opinion of the experts is that these rooms were used to hold gladiators and animals captive before they were released to do battle in the arena itself. Their existence was documented in the 18th century, well before the construction of the bull ring, and the roofs were re-discovered in 1999, but until now no-one was aware of how well they have survived the passing of two...