Government officials discover a horrible plot: the Chinese are tunneling their way to the United States.

Kerwin Mathews
as Cmdr. Jonathan Shaw

Viviane Ventura
as Tila Yung

Robert Ayres
as Adm. Felix Hillebrand

Peter Arne
as Arnold Kramer

Al Mulock
as Sgt. Marvin Mulberry

Martin Benson
as Gen. Chan Lu

Peter Elliott
as Dr. Kengh Lee

Earl Cameron
as Sgt. Seth Hawkins

John Brandon
as Maj. Frank Cannon

Ed Bishop
as Lt. Cmdr. Vance Cassidy (as Edward Bishop)
CinemaSerf
This starts off with a man lying on the pavement claiming he can hear mass burrowing noises below. Perhaps unsurprisingly he is taken away to be "looked after", but after an incident at a top secret underwater facility, then a mining disaster, the authorities start to investigate in earnest - and th...