Scuba diving and snorkelling are popular in the clear waters of Tangalle. When the seas are calm, from October to April, beautiful coral reefs, colourful fishes, and even sea turtles can be spotted. Tangalle Divers scuba shop near the Tangalle Bay Hotel offers daily trips during the season.

The Island’s underwater scenery is as spectacular as its picturesque landscape inland.Beneath its Indian Ocean waters lie submarine fairylands of coloured coral, Jewelhued tropical fish and mysterious submerged shipwrecks, which promise memorable sightseeing and exciting adventure for snorkelers and scuba divers. Its classic tropical location 5 to 9 degrees north of the equator, ensures perenially warm seas, which remain at an inviting temperature of around 27C, in season. The two monsoons; northwest and southwest govern the sea conditions and calm seas and clear water are experienced from November to April along the southern and western coasts and from April to October in the east.