Excavations have been completed by the Israel Antiquities Authority on a Second Temple period drainage tunnel that links the area of the Davidson Centre with the City of David. In the future there are plans to open the tunnel from the Davidson Centre allowing visitors to go under the Old City Walls.
Israel Inside Out notes that this will be another tunnel in this area adding to Hezekiah’s Tunnel also in the City of David and the Kotel Tunnels. These sites are incredible experiences and are mini time machines allowing the visitor to step back in time for an hour or so.
For further details Haaretz article