The events of making this movie was on the 1963 spoken word LP of ghost stories called Strange Truths' as told by Tom O'Neil. Which told of a time during filming when some of the crew had gotten lost, in a blizzard, on the mountain. The only thing that saved them was a mysterious climber, in a bright red jacket, appearing before them waving and shouting from about 10ft away. Though the crew couldn't hear they could feel a force opposite of the wind holding them back. When the storm abated they realized that not only would they have stepped off a cliff, had the red jacked climber not warned them, but he had also been standing in midair. When they told the villagers the story they were amazed when the people told them there had been a red jacketed climber who had recently fallen off that very cliff to his death and never seen again...until then. Suppose to be true.
In September 1957, while directing this film in the Swiss Bernese Alps, Burt Balaban nearly fell to his death from when he slipped from the face of a glacier on Jungfrau, a 13,000-foot peak while experimenting with a camera angle approximately 12,000 feet up on the mountain. A guide grabbed a rope around Balaban's waist and held him while Balaban dangled in the air with what would have been a 2000-foot plunge to rocks below. Fortunately, help came soon from two crew members and actor John Derek, one of the film's stars, and Balaban was pulled to safety with no injury.
Co-produced by UK company Rich & Rich Ltd. in England and Switzerland, and intended for North American audiences.