A spectacular flowstone formation dwarfs a cave explorer in an enormous stream cave in western Thailand. The cave, Tham Lum Khao Ngu, is located in a National Park of the same name in Kanchanaburi Province west of Bangkok. The lighting is natural sunlight filtering into the cave from an upstream entrance and a karst window downstream. The caver is in the picture to give the formation scale. The picture was taken with a Nikon FM2 set on a tripod with shutter release cable and an exposure of about 2 seconds, using Kodachrome film.