The video shows a person wearing a diving mask and snorkel, swimming underwater. The person is moving towards a wooden structure that is submerged in the water. The water is clear, and the person is wearing a black wetsuit. The wooden structure appears to be an old pier or dock, with some algae or marine growth visible on it. The person is holding onto the structure with one hand and appears to be looking around the area. The video does not show any other marine life or people.