Forty-eight minutes into this film noir, directed by John Huston and featuring a then-little-known Marilyn Monroe, leading man Dix Handley (Sterling Hayden), trying for one last big score so he can buy back his father’s Kentucky horse farm, drops into New York’s seething steam tunnels. Lucky for Dix, the tunnels are uncharacteristically cold; there is no steam in the pipes. Anybody who has ever worked in the New York netherworld of utility distribution knows the steam never is off in these passages; it is required by hospital sterilizers and dehumidification systems all year long. During summer and winter, the tunnels are as hot and humid as an afternoon in Singapore. Neither hair nor makeup was harmed in the making of this film.