As the search intensifies for the submersible that lost contact with its mother ship on Sunday as it descended to the wreck of the Titanic, many are wondering how deep the ocean is and what exactly ...

The submersible vehicle that was lost at sea is part of a relatively new effort enabling tourists and other paying customers to explore the depths of the ocean, the vast majority of which has never ...

What's at the bottom of the Mariana Trench, and how do we know? How deep does the ocean go? We'll answer these questions and more in this deep dive into the world's oceans. Come on in: The water's ...