91 minutos
Government officials discover a horrible plot: the Chinese are tunneling their way to the United States.
Kerwin Mathews
Cmdr. Jonathan Shaw
Viviane Ventura
Tila Yung
Robert Ayres
Adm. Felix Hillebrand
Peter Arne
Arnold Kramer
Al Mulock
Sgt. Marvin Mulberry
Martin Benson
Gen. Chan Lu
Peter Elliott
Dr. Kengh Lee
Earl Cameron
Sgt. Seth Hawkins
John Brandon
Maj. Frank Cannon
Ed Bishop
Lt. Cmdr. Vance Cassidy (as Edward Bishop)
Bill Nagy
Col. Talbot Wilson
Sarah Brackett
Meg Webson
Paula Li Shiu
Dr. Arnn
David Spenser
Maj. Chai
Michael McStay
Bomb Train Commander
Carl Jaffe
Dr. Galissi
Norma West
Susan Kramer
Larry Cross
Broadcaster
Bessie Love
Matron
Bee Duffell
Matron's Friend
Bill Hutchinson
Lanchek
Martin Terry
Mine Foreman
Frank Lieberman
Police
Roy Pattison
Police
Chela Matthison
Nurse
