Split Second (1953 film)

Split Second is a 1953 American film noir thriller directed by Dick Powell about escaped convicts and their hostages holed up in a ghost town, unaware of the grave danger they are in. It featured Stephen McNally, Alexis Smith, Jan Sterling, and Keith Andes.

Larry tries to warn the gangsters that the government is going to conduct an atomic bomb test nearby the next day, but Sam, their leader, does not believe him. When Arthur causes trouble, Sam kills him without a qualm. Meanwhile, Sam discovers that Kays husband is a doctor. He phones Neal Garven Richard Egan and threatens to kill his unfaithful wife unless he meets them. To Kays surprise, Neal still loves her enough to show up. He successfully operates on Bart, but warns Sam that moving his friend too soon will kill him. When Sam finally realizes that Larry was telling the truth, he still waits as long as possible to give Bart time to recuperate.Unknown to everyone, the test has been moved ahead an hour due to favorable weather conditions. When the fiveminute warning sounds earlier than expected, Sam and Bart hurry to Neals car and a desperate Kay gets in with them. Larry overpowers Dummy, but the others drive away. Asa leads the others to safety in a nearby mine. Sam, Bart and Kay are killed by the explosion, but the others emerge unharmed. ........

Source: Wikipedia