Unbeknownst to many tech divers around the world, Thailand is speckled with caves and caverns from north to south, many of which have never been fully explored. Earlier this month Aquanauts’ Roger M. Smith and fellow ANDI Instructor Bruce Konefe tackled the vast Song Hong cave, accessed via a sinkhole in remote Trang province.

Dived by only a handful of people since its discovery in 2006, the cave, about 960 km southwest from Pattaya, was notorious for its hard-to-find location, but has now been plotted on Google maps. It’s believed to have two entrances, but the easier-to-access opening is about 12 meters down in the 110-meter deep sinkhole. It then opens up into a huge cave, so large a light beam will not reach the opposite cave wall. (more…)