The video shows a crab and a fish in an underwater environment. The crab is brown and is seen moving around the ocean floor. The fish, which is grey and has a large mouth, is seen swimming around the crab. The fish appears to be interested in the crab and approaches it several times. The crab, on the other hand, seems to be unaffected by the fish's presence and continues to move around. The ocean floor is covered in rocks and coral, providing a natural habitat for these creatures. The water is clear, allowing for a good view of the crab and fish. Overall, the video captures a fascinating interaction between two marine animals in their natural habitat.