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Norbert Wu

Granite rock formations and Coconut Palms give the Seychelles islands their idyllic aesthetic.

Antarctica is a popular destination for scientists investigating alien oceans. The thick ice layers that cover and surround the continent conceal a freezing sea, rich with life—a configuration that closely mirrors the structure of the outer solar system’s icy moons, including Europa and Enceladus. To look for life in those extraterrestrial seas means accessing those buried oceans, so scientists are developing robotic submersibles and testing them in Antarctic waters.

An orca mother and calf find a spot to breathe between ice in the McMurdo Sound in Antarctica.

The Australian ghost shark has an elephant-like snout that detects prey on the ocean floor.

Deep-sea catshark. Galapagos Islands, Ecuador.

An orca mother and calf find a spot to breathe between ice in the McMurdo Sound in Antarctica.

Ceasar grunts and snappers delight a scuba diver in Belize.

Deep-sea catshark. Galapagos Islands, Ecuador.

A blue marlin swims in the Sea of Cortez off Baja California. Marlin are among the fish that are crowding toward the surface in some parts of the ocean as they flee low-oxygen zones in the deep.

A green sea turtle, Chelonia mydas, hatchling makes its way to the sea.