The video shows a brown otter swimming underwater in a clear tank. The otter is moving its body in a smooth, gliding motion, with its head and front paws occasionally breaking the surface of the water. The background of the tank is a rocky landscape with greenery, and there are bubbles visible around the otter as it moves. The otter's fur appears wet and matted, and it has a sleek, streamlined shape that allows it to move effortlessly through the water.