The video shows a person swimming underwater in a lake. The water is murky and green, and the person is wearing a snorkel mask. As the person swims, they come across a large rock covered in algae. The person then swims towards the rock and begins to explore it. The rock is covered in various types of aquatic plants and algae, and the person can be seen touching and feeling the different textures of the rock. The water is relatively calm, and there are no other visible creatures or objects in the vicinity. The person appears to be alone in the water, and there is no sound except for the sound of water and the person's breathing.