During the Vietnam war, the American army forms a special unit called "tunnel rats" to go down into the elaborate system of underground tunnels constructed by the Vietcong, kill anyone they find in it and destroy the system.
Reb Brown stars as a highly trained DEA agent who goes to Southeast Asia on a high-risk mission to free a drug dealer (Mike Monty) from nasty terrorists so that he can face trial back in the U.S.