This video shows a sea cucumber slowly moving across a sandy seabed in shallow, clear water. The sea cucumber is grey with irregular black spots and has an elongated, somewhat tubular shape. It appears to be inching its way along the bottom, leaving a faint trail in the sand. Scattered around the sandy area are small clumps of marine growth, possibly algae or coral fragments. The water is still and transparent, allowing a clear view of the substrate. The scene depicts a calm, sunlit underwater environment, likely a coastal area or reef flat, consistent with the provided location of Choeng Mon, Thailand.