While some travelers like to explore the variegated terrain of the land, it's easy to forget that there is another world waiting under the surface of the sea. In waters all over the globe, an entirely ...

- breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface; allows swimmer to breathe while face down in the water ...

All around the world, stunning coral reef systems are hiding just below the ocean waves. Breathtaking destinations like this pristine snorkeling spot in Oahu are perfect for diving into an underwater ...