The video shows a cartoon mouse wearing a diving suit and a bubble helmet swimming in a vibrant underwater scene. The mouse is surrounded by colorful coral reefs and fish. The water is a clear blue, and bubbles are visible around the mouse, indicating movement. The mouse appears to be exploring the reef, moving its arms and legs as it swims. The coral reefs are in shades of pink, purple, and yellow, and the fish are in various colors. The mouse's bubble helmet is transparent, and it has a happy expression on its face.