
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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