About 70 percent of the world is covered by oceans.
Russia's submersible drone, known to Russia as Poseidon and to the U.S. as Kanyon, may change nuclear warfare as we know it.
How long can you hold your breath underwater? These people can hold theirs for up to 13 minutes.
Scientists think the level of plastic is 16 times higher than previously thought.
The mythical land first mentioned by Plato has stirred imaginations ever since.
This dynamic duo is another deadly threat to coral reefs. But people can do something about it.
Russia's Viktor Leonov has been spotted close to the American mainland for the second time in a year.
It looks like a shark "that has undergone some kind of diabolical experiment."
But it can still be saved, scientists said.
Scientists have a new way of tracking hundreds of new species.
Dozens of species in the reserve cannot be found anywhere else in the world.
It was in the deepest sea trench on earth.
Fluorescent dye could be the answer to finding the ocean's missing plastics.
It's official: Plastic is utterly inescapable.
And someday soon, we're going to regret it.
Decades of climate research could be wrong, meaning we're in a much worse situation than previously thought.