On the west side of the six-lane Atatürk Boulevard stands a Byzantine cistern that is partly visible above ground: the so-called Zeyrek or Pantokrator Cistern, also named Unkapanı Cistern. The Zeyrek Cistern is also called Pantokrator Cistern because this cistern, together with smaller cisterns nearby, was part of the Byzantine Pantokrator Monastery complex, nowadays the Zeyrek Mosque, located on top of the hill against which the cistern was built. Because this cistern was built against a hill, the outside of one of the cistern walls can be seen, which is reinforced with buttresses and niches.
Crow et al., 2008, p. 116: the reconstructed Hadrianic line that follows the hillsides of Istanbul also passes the Pantokrator cistern close the the sout-west corner which has been confirmed as an inflow point. Supply from the Hadrian Waterway therefore seems likely. Water entered this cistern through an elevated channel which surrounds the main chamber at gallery level, and probably connected at the south-west side (Crow et al., 2008, p. 139-140).
Cistern (E5/2) Unkapanı on Atatürk Bulvarı (Crow et al., 2008, p. 148).
