America's best are in deep trouble.

Operation Delta Force 4: Deep Fault

When a group of seismologists are taken prison, the forces that be know that there is only one team of rescuers to turn to--the highly elite Delta Force. Upon beginning this difficult mission to track down and save the hostages, the men on the Force are met with several surprises--surprises that lead them to think this may be one mission they cannot get out of.