The entrance is a deep shaft, some from
Jingling Pot, the top section of which is lined with breeze-blocks. Below this a short drop enters a small stream passage which leads after some to a pitch. This enters a chamber, and a crawl continues which soon descends into a continuation of the stream passage. After a few metres (feet) this opens out at the head of Aquamole Aven - a deep shaft that passes a large ledge down. At the base of the shaft, downstream quickly leads to a large sump pool, and upstream terminates where a small stream descends from an aven. From the downstream sump a dive leads into Frake's Passage in Rowten Pot. The upstream sump has been explored for , with exploration continuing. A passage above the sump pool has been climbed into a stream passage with water flowing from Green Laids Pot. Three successive avens have been climbed to a point where the way on is too small. From the large ledge in Aquamole Aven, a small pitch upwards gains access to the One-armed Bandit Series. This starts as a large passage which traverses over a deep hole in the floor, before dividing. To the right a low wet crawl terminates just before the base of Jingling Pot. To the left, a series of large avens have been climbed almost to the surface. The deep holes in the One-Armed Bandit Series provide a second route to the sump, and starts with a deep shaft. A steeply descending rift then leads to an pitch which drops into the sump pool chamber. ==Geology and hydrology==