The opening of Cennet is 250 x 110 m2 (820 x 360 ft2) and its average dept is 70 metres (230 ft). It is possible to reach the bottom of Cennet by a primitive staircase composed of 300 steps. At the bottom toward the south, there is a smaller and 150 step deeper cave. In this cave are the ruins of a monastery built in the 5th century by a certain Paulus and dedicated to Virgin Mary. In this monastery one can hear the sound of a small underground stream which flows from the monastery to the gulf of Narlıkuyu.[1]