Take a look at the incredible barreleye fish and learn why they have a transparent forehead and glowing green eyes.

Scientists have revealed footage of a colossal squid swimming in the deep ocean. It's the first time we've seen one alive in ...

A U.K. startup wants to be the SpaceX of the deep sea, and hopes to establish a permanent human residence on the ocean floor ...

Imagine plunging into a world where sunlight barely penetrates, and the darkness is suddenly broken by mysterious flashes of ...

below the ocean surface and sustains life across our planet. It includes the twilight zone and the midnight zone, where strange and delicate animals thrive in the near absence of sunlight.

A one-foot-long baby squid was spotted swimming in the waters around the South Sandwich islands. The footage is unprecedented ...

Picture an ocean world so deep and ... the twilight zone and the midnight zone, where strange and delicate animals thrive in the near absence of sunlight. Whales and commercially valuable fish ...

It’s easy to forget that beneath the sunlit waves, just past where the ocean’s blue turns to jet-black, lies a world teeming ...

MIT oceanographers discovered big fish like tuna and swordfish get a large fraction of their food from the ocean’s twilight zone — a cold, dark layer about half a mile below the surface.