The film is set in Colorado, but shot in Italy. The U.S. Environmental Protection Agency will not allow the fear of being filmed in the United States that can be destroyed by the left crew. Italy is the choice because it is a spectacular mountain range similar to the Colorado Rockies. The production staff paid a very large deposit for cleaning up costs.
During the filming, an electrical storm struck and knocked down 5 crew members. Mountaineer Earl Wiggins was hit 3 times, but suffered only minor injuries.
Jie Ling Xiong Feng is the most expensive aerial stunt ever in the Guinness Book of World Records. Stuntman Simon Cran was paid $1 million to perform the aerial teleportation scene, and he traversed at an altitude of 15,000 feet (4,600 meters) on two planes.
The two main climbing doubles are Ron Kauk and Wolfgang Güllich. The latter served as Stallone's climbing stand-in before his death in a car accident in 1992.
Therefore, Stallone offers to reduce the cost of special effects production so that the movie can make its own movie fee. The stunt is performed by Simon Crane. Since the stunt is extremely dangerous, it is only performed once.
