The video shows a scuba diver underwater, holding onto a chain. The diver is wearing a black wetsuit and has a scuba tank on their back. The water is clear and blue, and there are several fish swimming around the diver. The diver appears to be exploring the underwater environment, looking around and observing the marine life. The chain the diver is holding onto seems to be attached to a buoy or a boat, suggesting that the diver is on a guided dive or a training exercise.