But each eye has two pupils, one above water, one below. And each pupil sends incoming visual info to a different side of the fish's retina. Cones in each half of the retina are adapted to produce ...

Photographer David Doubilet first dove below the surface at age 8 and has spent a lifetime making underwater images. He talks to NPR about his new book: Two Worlds: Above and Below the Sea.

In some cases, where an issue is above the water line, you can afford to wait a bit before engaging with it. It’s not a priority. But when you come across anything that rates as below the water ...

The ocean surface is the thinnest of lines between two worlds—”molecular thin”— underwater photographer David Doubilet calls it. Below is what Jacques Cousteau called “the silent world,” a realm as ...