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...