Only about 20% of the ocean’s depths has been mapped by humans. Here’s what we do — and don’t — know about the deep seas and why studying them is so precarious.

The ocean is changing colors, researchers say. Here's what it means. Warming waters are causing the colors of the ocean to change -- a trend that could impact humans if it were to continue ...

The Pacific Ocean is the largest of the Earth's ocean basins, according to the National Ocean Service. It contains more than half of the free water on Earth, spanning around 63 million square miles.

Dangerous tipping points Ocean acidification crosses “planetary boundaries” Crisis facing the world's marine ecosystems is getting worse.

The deep ocean covers most of the planet. Gerard Barron wants his company to be the first to mine it. That's been his dream since 2001, when Barron's then-tennis partner asked him to invest in a ...

The firm Ocean Infinity has launched a new search for missing Malaysia Airlines flight MH370 in what it says is a "more credible" patch of the Indian Ocean.