Tham Huai Bon (Nam) - CM0145

Martin Ellis - 29/06/2019

The inconspicuous entrance is often choked with flood debris and vegetation. From the entrance the cave leads steeply downwards to a large complex chamber on many interconnected levels. The far end of the chamber contains many inactive and a few active speleotherms. No leads were found from this chamber. There is a small stream that flows through the chamber, sinking below the lowest level of the floor of the chamber, but which is dry at the end of the dry season until below the chamber. The stream can be followed down to where it levels off and the air gets progressively worse. At this point a mud filled chamber can be climbed into, with no leads and also with bad air. The stream can be continued by crawling through half metre high passage a where it opens up to another 4-5m high chamber. There is another half metre crawl at the end of the chamber, where the stream sumps. The passage was fairly well searched, despite bad air, and no other side passage was seen.