Spyship

Spyship was a joint production of the BBC and Australia's Network 7. This is from old tape so the video isn't very sharp. A reviewer on IMDB wrote this:
This 6-part series centers on a male journalist and a female friend who are probing the loss of a British Fishing Trawler the "Mary Castor" with all hands on board. After interviewing the surviving family members and townspeople, the pair makes significant progress in piecing the puzzle together, only to find that things are not as they appear. They also begin to become a nuisance, and potential embarrassment to a group that would like to see their efforts fail. As their inquiries are hindered or blocked at every turn, the couple begins to understand the depth of the mystery, and are also terrified to find their lives are in danger.