The video shows a close-up of a giant clam, which is a large marine bivalve mollusk. The clam is situated on a coral reef, and its shell is open, revealing the interior. The reef is covered in various types of coral, including branching, plate, and soft corals. The water surrounding the reef is clear, allowing for a detailed view of the clam and its surroundings. The clam's shell is predominantly brown and speckled with white spots. The coral reef is a mix of colors, including shades of brown, green, and purple. The video does not contain any visible text or subtitles.