With cistern at 18/Π (P 10:1), two chambers connected by a passage.
18/Π went out of use first and was closed off from 17/ΟΕ-ΟΣΤ; filled up at one time with material dating between 350 and 300 B.C.
17/ΟΕ-ΟΣΤ ... 17 April 1937
27-28 May 1937 ... Agora XXVII, p. 228.