Government officials discover a horrible plot: the Chinese are tunneling their way to the United States.
Cast
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
Crew
Montgomery Tully
Director
Charles F. Vetter
Screenplay, Story, Executive Producer
Kenneth Talbot
Director of Photography
Pat Kelly
Assistant Director
Charles Reynolds
Producer
Alan McCabe
Camera Operator
J.B. Smith
Sound Recordist
Gerry Turner
Sound Recordist
Tom Howard
Special Effects
Ken Jones
Music
A.W. Watkins
Recording Supervision
Ronnie Bear
Production Manager
Sidney Stone
Supervising Editor
Jim Morahan
Art Direction
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