Foxbat - Henry Silva (1977) - Ma Nam Wat, Sai Kung

The baddies (which include a very young Melvin Wong) have a secret base on a fish farm in the New Territories. After a bit of looking around it looks as though this particular one was floating in front of Ma Nam Wat just outside of Hebe Haven. If the name of the place rings a bell it might be because this was also the area where Jack Palance filmed some of Kill a Dragon a decade earlier. There is still a fish farm in the same location today.