This video captures an underwater scene where a large sea snake is swimming near the ocean floor. The snake's body is elongated and slender, with a patterned skin that appears to be a mix of dark and light colors. The ocean floor is covered in rocks and coral, creating a textured landscape. As the video progresses, a scuba diver enters the frame, wearing a full diving suit and carrying a tank on their back. The diver approaches the snake cautiously and extends their hand towards it, seemingly trying to touch or interact with the creature. The snake appears to be aware of the diver's presence and moves its body in response. The water is a greenish-blue color, and the visibility is somewhat limited due to the underwater environment.