To the right are stairs leading down to Zimzim spring, which is forbidden to non-Yezidis.
The spring is located directly under the tomb of Sheikh Adi, which is the next room going onwards.
Two openings a little beyond [from the entrance into the main nave], lead into as many rooms, in each of which is a tomb, similar to that already described; and in one a door to some subterranean apartment, which we were not allowed to enter. [Late described in a floorpan as a chamber from where sacred clay is brought.] Badger 1852, p 106-107; of trips 1843-1850
"Badger 1852\r\nBadger, George Percy. 1852. The Nestorians and their Rituals. Google Books<\/a>"