Hellfire Pass is a part of the historical Thai-Burma railway route during World War II. It is 73 meters long, 25 meters deep and 25 meters high. It was created by cutting a hole in the rocky mountain at the hands of Austrian and British prisoners of war. Construction and cutting of the gorge began in April 1943. Construction took 3 months and prisoners of war had to work up to 18 hours a day. During the night, lamp oil is used. The dim lights flickered and the shadows of the POW soldiers appeared on the carved gorge walls, so it is a place that has been called Hellfire Gorge. Hellfire Pass is located behind the Hellfire Pass Museum. There is a nature trail from the museum to Khao Khat Pass.