The video shows a close-up view of a coral reef under the ocean. The reef is made up of various types of coral, including branching and plate corals. The colors of the coral range from light green to dark green, with some corals having a blue tint. The corals are densely packed together, creating a complex and intricate structure. The water surrounding the reef is clear, allowing for a detailed view of the coral formations. There are no visible fish or other marine life in the video.