This ramification is the longest of the cave: we have here 3 kilometres of passages. The main ramification extends south-west, to reach the active part of the cave. These are a series of underground lakes, the last of which is a Siphon, a technical term for a system of joint sinkholes. One of the sinkholes has a flowing river, which is the source of water for the lakes. A professional underwater exploration have reached a depth of 80 meters, without still touching the bottom. Another branch, developing north, is a system of galleries, which can be filled completely if torrential rain falls, making the explorations at times difficult. We have to remember that we are in the active part of the cave. This huge amount of water coming from the underground sources are the reason for the rounded vault preceding the entrance. Over the ramification, with only the river flow passing through, the ceiling changes is shape again to show a sharp top.