When a sub is seen off the coast. It appears to be an old German U-Boat from World War II. A message is sent saying that unless their demands are met, they will kill thousands of people. They agree to a meeting and Steve is sent to meet with the person. The person claims that the sub has a cache of nerve gas which when released and depending on the wind will reach a populated area. Oscar decides to send Steve to get into the sub and to try and neutralize the threat. But Steve is captured and is shown the nerve gas. But the Admiral receives information that there is no nerve gas on the sub so he decides to attack it with Steve on board. Written by
Did You Know?
Somebody in the production staff must have liked the number "509", since it is used for the submarine number in both this and the subsequent season's sub-related SMDM episode "Sharks". See more
The sub is shown sitting on the bottom of the sea in several shots during a good part of the movie, and it never gets underway afterwards, so it could not be suspended at mid-depth as it is seen in later shots, nor could it sink after the captain sets off the scuttling charges. See more