Tham Kong Lor is not the only major cave in the area. Tham Nam None is a 'new' cave that has been more recently discovered, but not yet fully explored. At 15km, it is one of the longest river caves in Laos, and it's possible to trek into the cave in the dry season. Don't venture into this cave alone; contact Spring River Resort to set up a trip and take plenty of torches (flashlights) and batteries.