The video shows a sea urchin with long spines moving slowly on a rock covered in algae. The sea urchin is orange in color and appears to be exploring its surroundings. The rock is covered in green and yellow algae, and the water around it is a murky green color. The sea urchin's spines are long and pointed, and it moves slowly across the rock. The video captures the sea urchin's movements and the surrounding environment in detail.