Four U.S. Navy aircraft carriers—all warships of the 100,000-ton, nuclear-powered Nimitz class—and two Chinese "flat-tops" are underway in the Pacific Ocean this week.

As for ocean basins, the Pacific Ocean is the world's largest, covering 63 million square miles, with deep depths averaging 13,000 feet. Drainage, structural and ocean are the major types of basins.

It's an intriguing finding that suggests a "lost world" could be lurking deep below the Pacific Ocean, highlighting how much there still is to learn about what's going on deep below our planet's ...

They suggest that it could even mean "a lost world" below the Pacific Ocean. Research revealed a "major mystery" deep beneath the Earth's bodies of water and crust.