Recently restored. Part of the Pantokrator monastery (now Zeyrek mosque).
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).