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James Cameron, who proclaimed himself the “king of the world” upon winning three Oscars for his 1997 film Titanic , can now proclaim himself king of the underworld as well. On Monday the moviemaker became the first solo aquanaut to reach the deepest recess of the Mariana Trench , touching down at the Challenger Deep site about 11 kilometers below the surface of the Pacific Ocean.

James Cameron, who proclaimed himself the “king of the world” upon winning three Oscars for his 1997 film Titanic , can now proclaim himself king of the underworld as well. On Monday the moviemaker became the first solo aquanaut to reach the deepest recess of the Mariana Trench , touching down at the Challenger Deep site about 11 kilometers below the surface of the Pacific Ocean.

With a lot of help from Flipper, scientists have a better shot at understanding phenomena like black holes and supernovae.

LOS ANGELES (Reuters) - Virgin Group founder Richard Branson, known for such exploits as trying to balloon around the world, said on Tuesday he planned to explore the deepest parts of the world's oceans with a jet-like submarine. The 18-foot vessel is capable of descents more than 36,000 feet below the surface, said Branson at a news conference in Newport Beach, California.

Dear EarthTalk : Recent news reports have revealed the discovery of previously unknown species inhabiting the deepest parts of our oceans. Is anything being done to protect this habitat before humans have a chance to fish it to death or otherwise destroy it? --Matthew Polk, Gary, Ind.