The film is based on the 'Colossal Cave Legend'. In 1884, five or six men robbed a mail train near Pantano, a small town near Tucson, Arizona Territory, and south of Colossal Cave, and nabbed about $83,000 in cash and gold. They hid all of the loot and it was never found. The story was also told in the "Death Valley Days" TV Series episode, 'Up the Chimney' (1968) and The Legend of 5 Mile Cave (2019).
Alexis Smith spent several hours in wardrobe being fitted for a pair of asbestos pants, as the film called for leading man Macdonald Carey to turn the actress over his knee and give her one of the hardest spankings ever administered to a female screen player.
This was director Willam Castle's first feature film in color.