A no-nonsense engineer is hired to oversee construction of the Whitney Tunnel, a project that has been plagued by a series of mysterious--and often fatal--accidents.
| Actor | Role |
|---|---|
 Victor JoryJohn O'Hara | John O'Hara |
 Sally O'NeilAnn Miller | Ann Miller |
 Johnny ArthurWillie Dent | Willie Dent |
 Ward BondDanny | Danny |
 Dewey RobinsonDave Shane | Dave Shane |
 Thurston HallJim Whitney | Jim Whitney |
 Robert GlecklerBill Anderson | Bill Anderson |
 Jonathan HaleChairman of the Board | Chairman of the Board |
 Howard HickmanBillings | Billings |
| JJeanie RobertsArabella | Arabella |
 Frank RiceSwede Mulhausen | Swede Mulhausen |
 George McKayNick Pollack | Nick Pollack |
 Robert MiddlemassHubbel | Hubbel |