A study of temperature recordings from the 1870s suggests that the oceans began warming more than 100 years ago, much earlier than previously believed.
Using a custom-built submersible, filmmaker James Cameron has successfully visited the Challenger Deep, the deepest point in the world's oceans? How do we know that there isn't somewhere deeper?
Cameron is using a submarine to descend nearly seven miles to the bottom of the Mariana Trench in the Pacific. The pressure below is the equivalent of three SUVs sitting on your toe.