This is 2 exposures blended together using my advanced Photoshop tonality control and multiple exposure blending techniques. I produced a video detailing these techniques, it's available here: www.zschnepf.com
This was taken while exploring with Marc Adamus in 2006. This was one of the images I used to develop my advanced tonality control techniques. It still holds a sense of wonder I felt while watching this scene unfold over a 5 minute exposure.