Internal Waves, Sulu Sea
Internal waves are a bit mysterious. If you were to stand on the shore of Palawan Island facing the Sulu Sea, you wouldn’t be able to see the waves coming toward you. That’s because the waves move along underwater, without rippling the surface. The Sulu Sea, like all major bodies of water, is composed of layers of water with differing densities. The topmost layer is the least dense, with each successively deeper layer being denser.