Todd Bolen/

To the right of the staircase when going down (the southern wall) a single arched entrance leads to a ritual immersion pool (mikveh). Two arched entrances (shown here) in front of the staircase (the eastern wall) lead to the largest ritual immersion pool yet to be discovered in Jerusalem.37 The third arched entrance (the northern wall) leads to a broad open-air courtyard (85 ft by 88 ft).