By the time he had reached the end of this sentence, the drain had ceased to exist. The masons had brought with them a length of wrist-thick lead pipe, which they thrust down the tunnel, then buried in a wheelbarrow-avalanche of mixed mortar and rubble. The head of the pipe was stomped down until it was flush with the floor, and then the eldest of the masons set about finish-work, arranging a few small flat paving-stones around the orifice to cover up the rubble fill beneath.